645352460352665 has 32 divisors (see below), whose sum is σ = 835141979992320. Its totient is φ = 475911992215296.

The previous prime is 645352460352629. The next prime is 645352460352701. The reversal of 645352460352665 is 566253064253546.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (645352460352629) and next prime (645352460352701).

It is not a de Polignac number, because 645352460352665 - 2⁶ = 645352460352601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645352460352598 and 645352460352607.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1728919271 + ... + 1729292499.

It is an arithmetic number, because the mean of its divisors is an integer number (26098186874760).

Almost surely, 2^{645352460352665} is an apocalyptic number.

645352460352665 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

645352460352665 is a deficient number, since it is larger than the sum of its proper divisors (189789519639655).

645352460352665 is a wasteful number, since it uses less digits than its factorization.

645352460352665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409793.

The product of its (nonzero) digits is 466560000, while the sum is 62.

The spelling of 645352460352665 in words is "six hundred forty-five trillion, three hundred fifty-two billion, four hundred sixty million, three hundred fifty-two thousand, six hundred sixty-five".