401277631647 has 4 divisors (see below), whose sum is σ = 535036842200. Its totient is φ = 267518421096.

The previous prime is 401277631597. The next prime is 401277631693. The reversal of 401277631647 is 746136772104.

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

It is not a de Polignac number, because 401277631647 - 2⁷ = 401277631519 is a prime.

It is a super-2 number, since 2×401277631647² (a number of 24 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 = 401277631596 and 401277631605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401277631247) 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, 66879605272 + ... + 66879605277.

It is an arithmetic number, because the mean of its divisors is an integer number (133759210550).

Almost surely, 2^401277631647 is an apocalyptic number.

401277631647 is a deficient number, since it is larger than the sum of its proper divisors (133759210553).

401277631647 is a wasteful number, since it uses less digits than its factorization.

401277631647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133759210552.

The product of its (nonzero) digits is 1185408, while the sum is 48.

The spelling of 401277631647 in words is "four hundred one billion, two hundred seventy-seven million, six hundred thirty-one thousand, six hundred forty-seven".