51002537721 has 8 divisors (see below), whose sum is σ = 68676684864. Its totient is φ = 33665041200.

The previous prime is 51002537711. The next prime is 51002537723. The reversal of 51002537721 is 12773520015.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51002537721 - 2⁶ = 51002537657 is a prime.

It is a super-5 number, since 5×51002537721⁵ (a number of 55 digits) contains 55555 as substring.

It is not an unprimeable number, because it can be changed into a prime (51002537723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84162301 + ... + 84162906.

It is an arithmetic number, because the mean of its divisors is an integer number (8584585608).

Almost surely, 2^51002537721 is an apocalyptic number.

It is an amenable number.

51002537721 is a deficient number, since it is larger than the sum of its proper divisors (17674147143).

51002537721 is a wasteful number, since it uses less digits than its factorization.

51002537721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168325311.

The product of its (nonzero) digits is 14700, while the sum is 33.

The spelling of 51002537721 in words is "fifty-one billion, two million, five hundred thirty-seven thousand, seven hundred twenty-one".