1156172390973 has 6 divisors (see below), whose sum is σ = 1670026786974. Its totient is φ = 770781593976.

The previous prime is 1156172390963. The next prime is 1156172390977. The reversal of 1156172390973 is 3790932716511.

1156172390973 is a `hidden beast` number, since 1 + 1 + 561 + 7 + 2 + 3 + 9 + 0 + 9 + 73 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1033642289124 + 122530101849 = 1016682^2 + 350043^2 .

It is not a de Polignac number, because 1156172390973 - 2³⁰ = 1155098649149 is a prime.

It is a super-3 number, since 3×1156172390973³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156172390977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64231799490 + ... + 64231799507.

It is an arithmetic number, because the mean of its divisors is an integer number (278337797829).

Almost surely, 2^{1156172390973} is an apocalyptic number.

It is an amenable number.

1156172390973 is a deficient number, since it is larger than the sum of its proper divisors (513854396001).

1156172390973 is a wasteful number, since it uses less digits than its factorization.

1156172390973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128463599003 (or 128463599000 counting only the distinct ones).

The product of its (nonzero) digits is 2143260, while the sum is 54.

The spelling of 1156172390973 in words is "one trillion, one hundred fifty-six billion, one hundred seventy-two million, three hundred ninety thousand, nine hundred seventy-three".