51535516641 has 16 divisors (see below), whose sum is σ = 80356598784. Its totient is φ = 28764008784.

The previous prime is 51535516621. The next prime is 51535516693. The reversal of 51535516641 is 14661553515.

It is not a de Polignac number, because 51535516641 - 2⁶ = 51535516577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51535516593 and 51535516602.

It is not an unprimeable number, because it can be changed into a prime (51535516621) 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, 28534821 + ... + 28536626.

It is an arithmetic number, because the mean of its divisors is an integer number (5022287424).

Almost surely, 2^51535516641 is an apocalyptic number.

It is an amenable number.

51535516641 is a deficient number, since it is larger than the sum of its proper divisors (28821082143).

51535516641 is a wasteful number, since it uses less digits than its factorization.

51535516641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57071500.

The product of its digits is 270000, while the sum is 42.

It can be divided in two parts, 515355 and 16641, that added together give a triangular number (531996 = T₁₀₃₁).

The spelling of 51535516641 in words is "fifty-one billion, five hundred thirty-five million, five hundred sixteen thousand, six hundred forty-one".