1640624525 has 12 divisors (see below), whose sum is σ = 2154044052. Its totient is φ = 1235293440.

The previous prime is 1640624467. The next prime is 1640624527. The reversal of 1640624525 is 5254260461.

It can be written as a sum of positive squares in 6 ways, for example, as 212521 + 1640412004 = 461^2 + 40502^2 .

It is not a de Polignac number, because 1640624525 - 2¹⁴ = 1640608141 is a prime.

It is a super-3 number, since 3×1640624525³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640624527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1929722 + ... + 1930571.

It is an arithmetic number, because the mean of its divisors is an integer number (179503671).

Almost surely, 2^1640624525 is an apocalyptic number.

It is an amenable number.

1640624525 is a deficient number, since it is larger than the sum of its proper divisors (513419527).

1640624525 is a wasteful number, since it uses less digits than its factorization.

1640624525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3860320 (or 3860315 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 1640624525 is about 40504.6235015214. The cubic root of 1640624525 is about 1179.4233812554.

Adding to 1640624525 its reverse (5254260461), we get a palindrome (6894884986).

The spelling of 1640624525 in words is "one billion, six hundred forty million, six hundred twenty-four thousand, five hundred twenty-five".