51478396965 has 56 divisors (see below), whose sum is σ = 92989397088. Its totient is φ = 27345276000.

The previous prime is 51478396943. The next prime is 51478396969. The reversal of 51478396965 is 56969387415.

It is not a de Polignac number, because 51478396965 - 2¹⁴ = 51478380581 is a prime.

It is a super-2 number, since 2×51478396965² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51478396969) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 886762 + ... + 943028.

It is an arithmetic number, because the mean of its divisors is an integer number (1660524948).

Almost surely, 2^51478396965 is an apocalyptic number.

It is an amenable number.

51478396965 is a deficient number, since it is larger than the sum of its proper divisors (41511000123).

51478396965 is an equidigital number, since it uses as much as digits as its factorization.

51478396965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56541 (or 56526 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 63.

The spelling of 51478396965 in words is "fifty-one billion, four hundred seventy-eight million, three hundred ninety-six thousand, nine hundred sixty-five".