51156033665 has 32 divisors (see below), whose sum is σ = 68230512000. Its totient is φ = 36508971520.

The previous prime is 51156033661. The next prime is 51156033679. The reversal of 51156033665 is 56633065115.

It is a happy number.

It is not a de Polignac number, because 51156033665 - 2² = 51156033661 is a prime.

It is a super-2 number, since 2×51156033665² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51156033661) 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, 642581 + ... + 717789.

It is an arithmetic number, because the mean of its divisors is an integer number (2132203500).

Almost surely, 2^51156033665 is an apocalyptic number.

51156033665 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51156033665 is a deficient number, since it is larger than the sum of its proper divisors (17074478335).

51156033665 is a wasteful number, since it uses less digits than its factorization.

51156033665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75457.

The product of its (nonzero) digits is 243000, while the sum is 41.

The spelling of 51156033665 in words is "fifty-one billion, one hundred fifty-six million, thirty-three thousand, six hundred sixty-five".