51990266772 has 48 divisors (see below), whose sum is σ = 135648157120. Its totient is φ = 17219700576.

The previous prime is 51990266771. The next prime is 51990266791. The reversal of 51990266772 is 27766209915.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51990266771) 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, 1516138 + ... + 1550049.

Almost surely, 2^51990266772 is an apocalyptic number.

It is an amenable number.

51990266772 is an abundant number, since it is smaller than the sum of its proper divisors (83657890348).

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

51990266772 is a wasteful number, since it uses less digits than its factorization.

51990266772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066357 (or 3066349 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The spelling of 51990266772 in words is "fifty-one billion, nine hundred ninety million, two hundred sixty-six thousand, seven hundred seventy-two".