645051136 has 18 divisors (see below), whose sum is σ = 1287583052. Its totient is φ = 322525440.

The previous prime is 645051133. The next prime is 645051151. The reversal of 645051136 is 631150546.

It is a junction number, because it is equal to n+sod(n) for n = 645051098 and 645051107.

It is not an unprimeable number, because it can be changed into a prime (645051133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1259610 + ... + 1260121.

Almost surely, 2^645051136 is an apocalyptic number.

It is an amenable number.

645051136 is a deficient number, since it is larger than the sum of its proper divisors (642531916).

645051136 is an equidigital number, since it uses as much as digits as its factorization.

645051136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2519747 (or 2519733 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 645051136 is about 25397.8569174645. The cubic root of 645051136 is about 864.0350923104.

The spelling of 645051136 in words is "six hundred forty-five million, fifty-one thousand, one hundred thirty-six".