67720107555 has 24 divisors (see below), whose sum is σ = 117898636752. Its totient is φ = 35958277824.

The previous prime is 67720107551. The next prime is 67720107593. The reversal of 67720107555 is 55570102776.

It is a happy number.

67720107555 is a `hidden beast` number, since 6 + 77 + 20 + 1 + 0 + 7 + 555 = 666.

It is not a de Polignac number, because 67720107555 - 2² = 67720107551 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 67720107555.

It is not an unprimeable number, because it can be changed into a prime (67720107551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3304524 + ... + 3324953.

It is an arithmetic number, because the mean of its divisors is an integer number (4912443198).

Almost surely, 2^67720107555 is an apocalyptic number.

67720107555 is a deficient number, since it is larger than the sum of its proper divisors (50178529197).

67720107555 is a wasteful number, since it uses less digits than its factorization.

67720107555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6629715 (or 6629712 counting only the distinct ones).

The product of its (nonzero) digits is 514500, while the sum is 45.

The spelling of 67720107555 in words is "sixty-seven billion, seven hundred twenty million, one hundred seven thousand, five hundred fifty-five".