67764564157 has 4 divisors (see below), whose sum is σ = 67768438780. Its totient is φ = 67760689536.

The previous prime is 67764564149. The next prime is 67764564167. The reversal of 67764564157 is 75146546776.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19531180516 + 48233383641 = 139754^2 + 219621^2 .

It is a cyclic number.

It is not a de Polignac number, because 67764564157 - 2³ = 67764564149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67764564167) 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, 1910958 + ... + 1946095.

It is an arithmetic number, because the mean of its divisors is an integer number (16942109695).

Almost surely, 2^67764564157 is an apocalyptic number.

It is an amenable number.

67764564157 is a deficient number, since it is larger than the sum of its proper divisors (3874623).

67764564157 is a wasteful number, since it uses less digits than its factorization.

67764564157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3874622.

The product of its digits is 29635200, while the sum is 58.

The spelling of 67764564157 in words is "sixty-seven billion, seven hundred sixty-four million, five hundred sixty-four thousand, one hundred fifty-seven".