1401668631 has 20 divisors (see below), whose sum is σ = 2284202184. Its totient is φ = 849495600.

The previous prime is 1401668623. The next prime is 1401668651. The reversal of 1401668631 is 1368661041.

1401668631 is a `hidden beast` number, since 1 + 4 + 0 + 16 + 6 + 8 + 631 = 666.

It is not a de Polignac number, because 1401668631 - 2³ = 1401668623 is a prime.

It is a super-2 number, since 2×1401668631² = 3929349902258828322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401668651) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 785680 + ... + 787461.

Almost surely, 2^1401668631 is an apocalyptic number.

1401668631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1401668631 is a deficient number, since it is larger than the sum of its proper divisors (882533553).

1401668631 is a wasteful number, since it uses less digits than its factorization.

1401668631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573164 (or 1573155 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1401668631 is about 37438.8652472267. The cubic root of 1401668631 is about 1119.1332130148.

The spelling of 1401668631 in words is "one billion, four hundred one million, six hundred sixty-eight thousand, six hundred thirty-one".