2157432451161 has 32 divisors (see below), whose sum is σ = 3161181421440. Its totient is φ = 1300682880000.

The previous prime is 2157432451001. The next prime is 2157432451243. The reversal of 2157432451161 is 1611542347512.

It is a happy number.

It is not a de Polignac number, because 2157432451161 - 2²⁵ = 2157398896729 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2157432401161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1209376 + ... + 2403633.

It is an arithmetic number, because the mean of its divisors is an integer number (98786919420).

Almost surely, 2^{2157432451161} is an apocalyptic number.

It is an amenable number.

2157432451161 is a deficient number, since it is larger than the sum of its proper divisors (1003748970279).

2157432451161 is a wasteful number, since it uses less digits than its factorization.

2157432451161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3613337.

The product of its digits is 201600, while the sum is 42.

Adding to 2157432451161 its reverse (1611542347512), we get a palindrome (3768974798673).

The spelling of 2157432451161 in words is "two trillion, one hundred fifty-seven billion, four hundred thirty-two million, four hundred fifty-one thousand, one hundred sixty-one".