625541661 has 12 divisors (see below), whose sum is σ = 903931392. Its totient is φ = 416856456.

The previous prime is 625541627. The next prime is 625541711. The reversal of 625541661 is 166145526.

It is not a de Polignac number, because 625541661 - 2⁷ = 625541533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625541461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11250 + ... + 37116.

It is an arithmetic number, because the mean of its divisors is an integer number (75327616).

Almost surely, 2^625541661 is an apocalyptic number.

It is an amenable number.

625541661 is a deficient number, since it is larger than the sum of its proper divisors (278389731).

625541661 is a wasteful number, since it uses less digits than its factorization.

625541661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28560 (or 28557 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 625541661 is about 25010.8308738434. The cubic root of 625541661 is about 855.2348959613.

The spelling of 625541661 in words is "six hundred twenty-five million, five hundred forty-one thousand, six hundred sixty-one".