625445681 has 8 divisors (see below), whose sum is σ = 718745664. Its totient is φ = 533133360.

The previous prime is 625445671. The next prime is 625445701. The reversal of 625445681 is 186544526.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 625445681 - 2⁶ = 625445617 is a prime.

It is a super-2 number, since 2×625445681² = 782364599763107522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (625445641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245555 + ... + 248088.

It is an arithmetic number, because the mean of its divisors is an integer number (89843208).

Almost surely, 2^625445681 is an apocalyptic number.

It is an amenable number.

625445681 is a deficient number, since it is larger than the sum of its proper divisors (93299983).

625445681 is a wasteful number, since it uses less digits than its factorization.

625445681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493831.

The product of its digits is 230400, while the sum is 41.

The square root of 625445681 is about 25008.9120315139. The cubic root of 625445681 is about 855.1911527283.

The spelling of 625445681 in words is "six hundred twenty-five million, four hundred forty-five thousand, six hundred eighty-one".