645802137 has 48 divisors (see below), whose sum is σ = 1041610752. Its totient is φ = 383662080.

The previous prime is 645802121. The next prime is 645802147. The reversal of 645802137 is 731208546.

645802137 is a `hidden beast` number, since 64 + 580 + 2 + 13 + 7 = 666.

645802137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645802137 - 2⁴ = 645802121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645802117) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 221473 + ... + 224369.

It is an arithmetic number, because the mean of its divisors is an integer number (21700224).

Almost surely, 2^645802137 is an apocalyptic number.

It is an amenable number.

645802137 is a deficient number, since it is larger than the sum of its proper divisors (395808615).

645802137 is a wasteful number, since it uses less digits than its factorization.

645802137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2998 (or 2995 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 645802137 is about 25412.6373483745. The cubic root of 645802137 is about 864.3702799779.

The spelling of 645802137 in words is "six hundred forty-five million, eight hundred two thousand, one hundred thirty-seven".