161637432007751 has 32 divisors (see below), whose sum is σ = 189453642240000. Its totient is φ = 137844372093120.

The previous prime is 161637432007717. The next prime is 161637432007757. The reversal of 161637432007751 is 157700234736161.

It is not a de Polignac number, because 161637432007751 - 2¹⁴ = 161637431991367 is a prime.

It is a super-2 number, since 2×161637432007751² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161637432007693 and 161637432007702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161637432007757) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2705063291 + ... + 2705123043.

It is an arithmetic number, because the mean of its divisors is an integer number (5920426320000).

Almost surely, 2^{161637432007751} is an apocalyptic number.

161637432007751 is a deficient number, since it is larger than the sum of its proper divisors (27816210232249).

161637432007751 is an equidigital number, since it uses as much as digits as its factorization.

161637432007751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99604 (or 99590 counting only the distinct ones).

The product of its (nonzero) digits is 4445280, while the sum is 53.

The spelling of 161637432007751 in words is "one hundred sixty-one trillion, six hundred thirty-seven billion, four hundred thirty-two million, seven thousand, seven hundred fifty-one".