645180737 has 2 divisors, whose sum is σ = 645180738. Its totient is φ = 645180736.

The previous prime is 645180671. The next prime is 645180743. The reversal of 645180737 is 737081546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 541772176 + 103408561 = 23276^2 + 10169^2 .

It is a cyclic number.

It is not a de Polignac number, because 645180737 - 2¹⁴ = 645164353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645180694 and 645180703.

It is not a weakly prime, because it can be changed into another prime (645189737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322590368 + 322590369.

It is an arithmetic number, because the mean of its divisors is an integer number (322590369).

Almost surely, 2^645180737 is an apocalyptic number.

It is an amenable number.

645180737 is a deficient number, since it is larger than the sum of its proper divisors (1).

645180737 is an equidigital number, since it uses as much as digits as its factorization.

645180737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 645180737 is about 25400.4082053813. The cubic root of 645180737 is about 864.0929545516.

The spelling of 645180737 in words is "six hundred forty-five million, one hundred eighty thousand, seven hundred thirty-seven".