625656506 has 4 divisors (see below), whose sum is σ = 938484762. Its totient is φ = 312828252.

The previous prime is 625656503. The next prime is 625656509. The reversal of 625656506 is 605656526.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 605656526 = 2 ⋅302828263.

It is an interprime number because it is at equal distance from previous prime (625656503) and next prime (625656509).

It can be written as a sum of positive squares in only one way, i.e., 508908481 + 116748025 = 22559^2 + 10805^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (625656503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156414125 + ... + 156414128.

Almost surely, 2^625656506 is an apocalyptic number.

625656506 is a deficient number, since it is larger than the sum of its proper divisors (312828256).

625656506 is a wasteful number, since it uses less digits than its factorization.

625656506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312828255.

The product of its (nonzero) digits is 324000, while the sum is 41.

The square root of 625656506 is about 25013.1266738087. The cubic root of 625656506 is about 855.2872311067.

The spelling of 625656506 in words is "six hundred twenty-five million, six hundred fifty-six thousand, five hundred six".