51151002172 has 6 divisors (see below), whose sum is σ = 89514253808. Its totient is φ = 25575501084.

The previous prime is 51151002073. The next prime is 51151002173. The reversal of 51151002172 is 27120015115.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51151002173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6393875268 + ... + 6393875275.

Almost surely, 2^51151002172 is an apocalyptic number.

It is an amenable number.

51151002172 is a deficient number, since it is larger than the sum of its proper divisors (38363251636).

51151002172 is a wasteful number, since it uses less digits than its factorization.

51151002172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12787750547 (or 12787750545 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 25.

Adding to 51151002172 its reverse (27120015115), we get a palindrome (78271017287).

The spelling of 51151002172 in words is "fifty-one billion, one hundred fifty-one million, two thousand, one hundred seventy-two".