7745644157 has 4 divisors (see below), whose sum is σ = 7750204800. Its totient is φ = 7741083516.

The previous prime is 7745644087. The next prime is 7745644189. The reversal of 7745644157 is 7514465477.

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 not a de Polignac number, because 7745644157 - 2²⁸ = 7477208701 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 (7745640157) 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, 2277773 + ... + 2281170.

It is an arithmetic number, because the mean of its divisors is an integer number (1937551200).

Almost surely, 2^7745644157 is an apocalyptic number.

It is an amenable number.

7745644157 is a deficient number, since it is larger than the sum of its proper divisors (4560643).

7745644157 is a wasteful number, since it uses less digits than its factorization.

7745644157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4560642.

The product of its digits is 3292800, while the sum is 50.

The square root of 7745644157 is about 88009.3413053410. The cubic root of 7745644157 is about 1978.5749836500.

The spelling of 7745644157 in words is "seven billion, seven hundred forty-five million, six hundred forty-four thousand, one hundred fifty-seven".