51642507786 has 8 divisors (see below), whose sum is σ = 103285015584. Its totient is φ = 17214169260.

The previous prime is 51642507773. The next prime is 51642507797. The reversal of 51642507786 is 68770524615.

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

51642507786 is an admirable number.

It is a super-2 number, since 2×51642507786² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4303542310 + ... + 4303542321.

It is an arithmetic number, because the mean of its divisors is an integer number (12910626948).

Almost surely, 2^51642507786 is an apocalyptic number.

51642507786 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51642507786 is a wasteful number, since it uses less digits than its factorization.

51642507786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8607084636.

The product of its (nonzero) digits is 2822400, while the sum is 51.

The spelling of 51642507786 in words is "fifty-one billion, six hundred forty-two million, five hundred seven thousand, seven hundred eighty-six".