145251191693 has 4 divisors (see below), whose sum is σ = 145254004128. Its totient is φ = 145248379260.

The previous prime is 145251191639. The next prime is 145251191731. The reversal of 145251191693 is 396191152541.

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, and also an emirpimes, since its reverse is a distinct semiprime: 396191152541 = 249853 ⋅1585697.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145251191693 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 (145251191633) 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, 1327271 + ... + 1432532.

It is an arithmetic number, because the mean of its divisors is an integer number (36313501032).

Almost surely, 2^145251191693 is an apocalyptic number.

It is an amenable number.

145251191693 is a deficient number, since it is larger than the sum of its proper divisors (2812435).

145251191693 is an equidigital number, since it uses as much as digits as its factorization.

145251191693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2812434.

The product of its digits is 291600, while the sum is 47.

The spelling of 145251191693 in words is "one hundred forty-five billion, two hundred fifty-one million, one hundred ninety-one thousand, six hundred ninety-three".