67515920640 has 432 divisors, whose sum is σ = 267845760000. Its totient is φ = 15381577728.

The previous prime is 67515920623. The next prime is 67515920669. The reversal of 67515920640 is 4602951576.

67515920640 is a `hidden beast` number, since 6 + 7 + 51 + 592 + 0 + 6 + 4 + 0 = 666.

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

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28142161 + ... + 28144559.

Almost surely, 2^67515920640 is an apocalyptic number.

67515920640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67515920640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133922880000).

67515920640 is an abundant number, since it is smaller than the sum of its proper divisors (200329839360).

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

67515920640 is a wasteful number, since it uses less digits than its factorization.

67515920640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2782 (or 2765 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 67515920640 in words is "sixty-seven billion, five hundred fifteen million, nine hundred twenty thousand, six hundred forty".