625220661 has 16 divisors (see below), whose sum is σ = 936786816. Its totient is φ = 368022336.

The previous prime is 625220623. The next prime is 625220663. The reversal of 625220661 is 166022526.

It is not a de Polignac number, because 625220661 - 2¹¹ = 625218613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625220663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 347610 + ... + 349403.

It is an arithmetic number, because the mean of its divisors is an integer number (58549176).

Almost surely, 2^625220661 is an apocalyptic number.

It is an amenable number.

625220661 is a deficient number, since it is larger than the sum of its proper divisors (311566155).

625220661 is a wasteful number, since it uses less digits than its factorization.

625220661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697052.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 625220661 is about 25004.4128305385. The cubic root of 625220661 is about 855.0885814998.

The spelling of 625220661 in words is "six hundred twenty-five million, two hundred twenty thousand, six hundred sixty-one".