67645620315 has 80 divisors (see below), whose sum is σ = 149244435648. Its totient is φ = 28544949504.

The previous prime is 67645620269. The next prime is 67645620331. The reversal of 67645620315 is 51302654676.

67645620315 is a `hidden beast` number, since 6 + 7 + 6 + 4 + 5 + 620 + 3 + 15 = 666.

It is not a de Polignac number, because 67645620315 - 2⁸ = 67645620059 is a prime.

It is a super-2 number, since 2×67645620315² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 880872 + ... + 954581.

Almost surely, 2^67645620315 is an apocalyptic number.

67645620315 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

67645620315 is an abundant number, since it is smaller than the sum of its proper divisors (81598815333).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

67645620315 is a wasteful number, since it uses less digits than its factorization.

67645620315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835490 (or 1835481 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 45.

The spelling of 67645620315 in words is "sixty-seven billion, six hundred forty-five million, six hundred twenty thousand, three hundred fifteen".