51642017536 has 72 divisors (see below), whose sum is σ = 106154968304. Its totient is φ = 25059041280.

The previous prime is 51642017513. The next prime is 51642017591. The reversal of 51642017536 is 63571024615.

It is a super-2 number, since 2×51642017536² (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 in 7 ways as a sum of consecutive naturals, for example, 1713316 + ... + 1743196.

Almost surely, 2^51642017536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51642017536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53077484152).

51642017536 is an abundant number, since it is smaller than the sum of its proper divisors (54512950768).

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

51642017536 is a wasteful number, since it uses less digits than its factorization.

51642017536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30097 (or 30083 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 51642017536 in words is "fifty-one billion, six hundred forty-two million, seventeen thousand, five hundred thirty-six".