51402601556 has 6 divisors (see below), whose sum is σ = 89954552730. Its totient is φ = 25701300776.

The previous prime is 51402601517. The next prime is 51402601589. The reversal of 51402601556 is 65510620415.

It can be written as a sum of positive squares in only one way, i.e., 45810553156 + 5592048400 = 214034^2 + 74780^2 .

It is a super-2 number, since 2×51402601556² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6425325191 + ... + 6425325198.

It is an arithmetic number, because the mean of its divisors is an integer number (14992425455).

Almost surely, 2^51402601556 is an apocalyptic number.

It is an amenable number.

51402601556 is a deficient number, since it is larger than the sum of its proper divisors (38551951174).

51402601556 is a wasteful number, since it uses less digits than its factorization.

51402601556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12850650393 (or 12850650391 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 51402601556 in words is "fifty-one billion, four hundred two million, six hundred one thousand, five hundred fifty-six".