1001161511656 has 8 divisors (see below), whose sum is σ = 1877177834370. Its totient is φ = 500580755824.

The previous prime is 1001161511639. The next prime is 1001161511683. The reversal of 1001161511656 is 6561151611001.

It can be written as a sum of positive squares in only one way, i.e., 703863949156 + 297297562500 = 838966^2 + 545250^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62572594471 + ... + 62572594486.

Almost surely, 2^{1001161511656} is an apocalyptic number.

It is an amenable number.

1001161511656 is a deficient number, since it is larger than the sum of its proper divisors (876016322714).

1001161511656 is a wasteful number, since it uses less digits than its factorization.

1001161511656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125145188963 (or 125145188959 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 34.

The spelling of 1001161511656 in words is "one trillion, one billion, one hundred sixty-one million, five hundred eleven thousand, six hundred fifty-six".