51604077658 has 16 divisors (see below), whose sum is σ = 90269524800. Its totient is φ = 22116032988.

The previous prime is 51604077641. The next prime is 51604077659. The reversal of 51604077658 is 85677040615.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (51604077659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37611616 + ... + 37612987.

It is an arithmetic number, because the mean of its divisors is an integer number (5641845300).

Almost surely, 2^51604077658 is an apocalyptic number.

51604077658 is a deficient number, since it is larger than the sum of its proper divisors (38665447142).

51604077658 is an equidigital number, since it uses as much as digits as its factorization.

51604077658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75224626 (or 75224612 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 49.

The spelling of 51604077658 in words is "fifty-one billion, six hundred four million, seventy-seven thousand, six hundred fifty-eight".