67720774907 has 4 divisors (see below), whose sum is σ = 67733856120. Its totient is φ = 67707693696.

The previous prime is 67720774843. The next prime is 67720774969. The reversal of 67720774907 is 70947702776.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 67720774907 - 2⁶ = 67720774843 is a prime.

It is a super-2 number, since 2×67720774907² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67720774987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6532838 + ... + 6543195.

It is an arithmetic number, because the mean of its divisors is an integer number (16933464030).

Almost surely, 2^67720774907 is an apocalyptic number.

67720774907 is a deficient number, since it is larger than the sum of its proper divisors (13081213).

67720774907 is a wasteful number, since it uses less digits than its factorization.

67720774907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13081212.

The product of its (nonzero) digits is 7260624, while the sum is 56.

The spelling of 67720774907 in words is "sixty-seven billion, seven hundred twenty million, seven hundred seventy-four thousand, nine hundred seven".