155540077 has 8 divisors (see below), whose sum is σ = 193920192. Its totient is φ = 121200000.

The previous prime is 155540069. The next prime is 155540087. The reversal of 155540077 is 770045551.

It is a happy number.

155540077 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155540077 - 2³ = 155540069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155540087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1009924 + ... + 1010077.

It is an arithmetic number, because the mean of its divisors is an integer number (24240024).

Almost surely, 2^155540077 is an apocalyptic number.

It is an amenable number.

155540077 is a deficient number, since it is larger than the sum of its proper divisors (38380115).

155540077 is a wasteful number, since it uses less digits than its factorization.

155540077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020019.

The product of its (nonzero) digits is 24500, while the sum is 34.

The square root of 155540077 is about 12471.5707511123. The cubic root of 155540077 is about 537.7917098368.

The spelling of 155540077 in words is "one hundred fifty-five million, five hundred forty thousand, seventy-seven".