51601025778 has 32 divisors (see below), whose sum is σ = 109325711040. Its totient is φ = 16191264960.

The previous prime is 51601025743. The next prime is 51601025779. The reversal of 51601025778 is 87752010615.

It is a super-2 number, since 2×51601025778² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51601025779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1423633 + ... + 1459428.

It is an arithmetic number, because the mean of its divisors is an integer number (3416428470).

Almost surely, 2^51601025778 is an apocalyptic number.

51601025778 is an abundant number, since it is smaller than the sum of its proper divisors (57724685262).

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

51601025778 is a wasteful number, since it uses less digits than its factorization.

51601025778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2883242.

The product of its (nonzero) digits is 117600, while the sum is 42.

The spelling of 51601025778 in words is "fifty-one billion, six hundred one million, twenty-five thousand, seven hundred seventy-eight".