18601151957 has 4 divisors (see below), whose sum is σ = 19242571020. Its totient is φ = 17959732896.

The previous prime is 18601151903. The next prime is 18601151993. The reversal of 18601151957 is 75915110681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7619369521 + 10981782436 = 87289^2 + 104794^2 .

It is a cyclic number.

It is not a de Polignac number, because 18601151957 - 2⁶ = 18601151893 is a prime.

It is a super-4 number, since 4×18601151957⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18601157957) 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, 320709488 + ... + 320709545.

It is an arithmetic number, because the mean of its divisors is an integer number (4810642755).

Almost surely, 2^18601151957 is an apocalyptic number.

It is an amenable number.

18601151957 is a deficient number, since it is larger than the sum of its proper divisors (641419063).

18601151957 is an equidigital number, since it uses as much as digits as its factorization.

18601151957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641419062.

The product of its (nonzero) digits is 75600, while the sum is 44.

The spelling of 18601151957 in words is "eighteen billion, six hundred one million, one hundred fifty-one thousand, nine hundred fifty-seven".