51181620974 has 16 divisors (see below), whose sum is σ = 83779557120. Its totient is φ = 23256647160.

The previous prime is 51181620947. The next prime is 51181620989. The reversal of 51181620974 is 47902618115.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318284 + ... + 451295.

It is an arithmetic number, because the mean of its divisors is an integer number (5236222320).

Almost surely, 2^51181620974 is an apocalyptic number.

51181620974 is a deficient number, since it is larger than the sum of its proper divisors (32597936146).

51181620974 is a wasteful number, since it uses less digits than its factorization.

51181620974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772615.

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 51181620974 in words is "fifty-one billion, one hundred eighty-one million, six hundred twenty thousand, nine hundred seventy-four".