51525020001 has 64 divisors (see below), whose sum is σ = 86307379200. Its totient is φ = 26620171776.

The previous prime is 51525019991. The next prime is 51525020011. The reversal of 51525020001 is 10002052515.

It is an interprime number because it is at equal distance from previous prime (51525019991) and next prime (51525020011).

It is not a de Polignac number, because 51525020001 - 2⁶ = 51525019937 is a prime.

It is a super-2 number, since 2×51525020001² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 51525020001.

It is not an unprimeable number, because it can be changed into a prime (51525020011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2589870 + ... + 2609688.

It is an arithmetic number, because the mean of its divisors is an integer number (1348552800).

Almost surely, 2^51525020001 is an apocalyptic number.

It is an amenable number.

51525020001 is a deficient number, since it is larger than the sum of its proper divisors (34782359199).

51525020001 is a wasteful number, since it uses less digits than its factorization.

51525020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20038.

The product of its (nonzero) digits is 500, while the sum is 21.

Adding to 51525020001 its reverse (10002052515), we get a palindrome (61527072516).

The spelling of 51525020001 in words is "fifty-one billion, five hundred twenty-five million, twenty thousand, one".