51156446997 has 8 divisors (see below), whose sum is σ = 68217240960. Its totient is φ = 34099975520.

The previous prime is 51156446989. The next prime is 51156447047. The reversal of 51156446997 is 79964465115.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51156446997 - 2³ = 51156446989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51156446917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1052904 + ... + 1100417.

It is an arithmetic number, because the mean of its divisors is an integer number (8527155120).

Almost surely, 2^51156446997 is an apocalyptic number.

It is an amenable number.

51156446997 is a deficient number, since it is larger than the sum of its proper divisors (17060793963).

51156446997 is a wasteful number, since it uses less digits than its factorization.

51156446997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2161243.

The product of its digits is 8164800, while the sum is 57.

The spelling of 51156446997 in words is "fifty-one billion, one hundred fifty-six million, four hundred forty-six thousand, nine hundred ninety-seven".