645062136610 has 16 divisors (see below), whose sum is σ = 1164774665016. Its totient is φ = 257210894848.

The previous prime is 645062136599. The next prime is 645062136647. The reversal of 645062136610 is 16631260546.

It can be written as a sum of positive squares in 4 ways, for example, as 489847411881 + 155214724729 = 699891^2 + 393973^2 .

It is a super-2 number, since 2×645062136610² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101741647 + ... + 101747986.

Almost surely, 2^645062136610 is an apocalyptic number.

645062136610 is a deficient number, since it is larger than the sum of its proper divisors (519712528406).

645062136610 is a wasteful number, since it uses less digits than its factorization.

645062136610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203489957.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 645062136610 in words is "six hundred forty-five billion, sixty-two million, one hundred thirty-six thousand, six hundred ten".