51645501501 has 32 divisors (see below), whose sum is σ = 78544512000. Its totient is φ = 29879203200.

The previous prime is 51645501493. The next prime is 51645501503. The reversal of 51645501501 is 10510554615.

It is not a de Polignac number, because 51645501501 - 2³ = 51645501493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51645501503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 310561 + ... + 446921.

It is an arithmetic number, because the mean of its divisors is an integer number (2454516000).

Almost surely, 2^51645501501 is an apocalyptic number.

It is an amenable number.

51645501501 is a deficient number, since it is larger than the sum of its proper divisors (26899010499).

51645501501 is a wasteful number, since it uses less digits than its factorization.

51645501501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136897.

The product of its (nonzero) digits is 15000, while the sum is 33.

The spelling of 51645501501 in words is "fifty-one billion, six hundred forty-five million, five hundred one thousand, five hundred one".