864556091159551 has 6 divisors (see below), whose sum is σ = 1005708106042800. Its totient is φ = 741048078136716.

The previous prime is 864556091159483. The next prime is 864556091159557. The reversal of 864556091159551 is 155951190655468.

It is not a de Polignac number, because 864556091159551 - 2⁹ = 864556091159039 is a prime.

It is a super-2 number, since 2×864556091159551² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864556091159557) 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, 8822000930151 + ... + 8822000930248.

It is an arithmetic number, because the mean of its divisors is an integer number (167618017673800).

Almost surely, 2^{864556091159551} is an apocalyptic number.

864556091159551 is a deficient number, since it is larger than the sum of its proper divisors (141152014883249).

864556091159551 is a wasteful number, since it uses less digits than its factorization.

864556091159551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17644001860413 (or 17644001860406 counting only the distinct ones).

The product of its (nonzero) digits is 291600000, while the sum is 70.

The spelling of 864556091159551 in words is "eight hundred sixty-four trillion, five hundred fifty-six billion, ninety-one million, one hundred fifty-nine thousand, five hundred fifty-one".