646451553025 has 12 divisors (see below), whose sum is σ = 804160957612. Its totient is φ = 515508963840.

The previous prime is 646451553001. The next prime is 646451553073. The reversal of 646451553025 is 520355154646.

It can be written as a sum of positive squares in 6 ways, for example, as 210782910321 + 435668642704 = 459111^2 + 660052^2 .

It is not a de Polignac number, because 646451553025 - 2⁷ = 646451552897 is a prime.

It is a super-2 number, since 2×646451553025² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41298984 + ... + 41314633.

Almost surely, 2^646451553025 is an apocalyptic number.

It is an amenable number.

646451553025 is a deficient number, since it is larger than the sum of its proper divisors (157709404587).

646451553025 is a wasteful number, since it uses less digits than its factorization.

646451553025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82613940 (or 82613935 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 46.

The spelling of 646451553025 in words is "six hundred forty-six billion, four hundred fifty-one million, five hundred fifty-three thousand, twenty-five".