61123636513 has 4 divisors (see below), whose sum is σ = 61152926400. Its totient is φ = 61094346628.

The previous prime is 61123636507. The next prime is 61123636529. The reversal of 61123636513 is 31563632116.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61123636513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61123634513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14641813 + ... + 14645986.

It is an arithmetic number, because the mean of its divisors is an integer number (15288231600).

Almost surely, 2^61123636513 is an apocalyptic number.

It is an amenable number.

61123636513 is a deficient number, since it is larger than the sum of its proper divisors (29289887).

61123636513 is a wasteful number, since it uses less digits than its factorization.

61123636513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29289886.

The product of its digits is 58320, while the sum is 37.

The spelling of 61123636513 in words is "sixty-one billion, one hundred twenty-three million, six hundred thirty-six thousand, five hundred thirteen".