664702761562761 has 8 divisors (see below), whose sum is σ = 889157222851744. Its totient is φ = 441691737324480.

The previous prime is 664702761562759. The next prime is 664702761562787. The reversal of 664702761562761 is 167265167207466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664702761562761 - 2¹ = 664702761562759 is a prime.

It is a super-2 number, since 2×664702761562761² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664702761562692 and 664702761562701.

It is not an unprimeable number, because it can be changed into a prime (664702761564761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360859261600 + ... + 360859263441.

It is an arithmetic number, because the mean of its divisors is an integer number (111144652856468).

Almost surely, 2^{664702761562761} is an apocalyptic number.

It is an amenable number.

664702761562761 is a deficient number, since it is larger than the sum of its proper divisors (224454461288983).

664702761562761 is a wasteful number, since it uses less digits than its factorization.

664702761562761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721718525351.

The product of its (nonzero) digits is 213373440, while the sum is 66.

The spelling of 664702761562761 in words is "six hundred sixty-four trillion, seven hundred two billion, seven hundred sixty-one million, five hundred sixty-two thousand, seven hundred sixty-one".