161751572787 has 32 divisors (see below), whose sum is σ = 259477235200. Its totient is φ = 87555955968.

The previous prime is 161751572701. The next prime is 161751572797. The reversal of 161751572787 is 787275157161.

It is not a de Polignac number, because 161751572787 - 2¹² = 161751568691 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161751572797) 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, 6854613 + ... + 6878169.

It is an arithmetic number, because the mean of its divisors is an integer number (8108663600).

Almost surely, 2^161751572787 is an apocalyptic number.

161751572787 is a deficient number, since it is larger than the sum of its proper divisors (97725662413).

161751572787 is a wasteful number, since it uses less digits than its factorization.

161751572787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40795.

The product of its digits is 5762400, while the sum is 57.

The spelling of 161751572787 in words is "one hundred sixty-one billion, seven hundred fifty-one million, five hundred seventy-two thousand, seven hundred eighty-seven".