406720577631 has 4 divisors (see below), whose sum is σ = 542294103512. Its totient is φ = 271147051752.

The previous prime is 406720577581. The next prime is 406720577677. The reversal of 406720577631 is 136775027604.

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

It is not a de Polignac number, because 406720577631 - 2³⁰ = 405646835807 is a prime.

It is a super-2 number, since 2×406720577631² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406720577831) 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, 67786762936 + ... + 67786762941.

It is an arithmetic number, because the mean of its divisors is an integer number (135573525878).

Almost surely, 2^406720577631 is an apocalyptic number.

406720577631 is a deficient number, since it is larger than the sum of its proper divisors (135573525881).

406720577631 is a wasteful number, since it uses less digits than its factorization.

406720577631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135573525880.

The product of its (nonzero) digits is 1481760, while the sum is 48.

The spelling of 406720577631 in words is "four hundred six billion, seven hundred twenty million, five hundred seventy-seven thousand, six hundred thirty-one".