51156526521 has 4 divisors (see below), whose sum is σ = 68208702032. Its totient is φ = 34104351012.

The previous prime is 51156526501. The next prime is 51156526541. The reversal of 51156526521 is 12562565115.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (51156526501) and next prime (51156526541).

It is not a de Polignac number, because 51156526521 - 2¹⁴ = 51156510137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51156526521.

It is not an unprimeable number, because it can be changed into a prime (51156526501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8526087751 + ... + 8526087756.

It is an arithmetic number, because the mean of its divisors is an integer number (17052175508).

Almost surely, 2^51156526521 is an apocalyptic number.

It is an amenable number.

51156526521 is a deficient number, since it is larger than the sum of its proper divisors (17052175511).

51156526521 is a wasteful number, since it uses less digits than its factorization.

51156526521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17052175510.

The product of its digits is 90000, while the sum is 39.

The spelling of 51156526521 in words is "fifty-one billion, one hundred fifty-six million, five hundred twenty-six thousand, five hundred twenty-one".