1631627626421 has 4 divisors (see below), whose sum is σ = 1757137443852. Its totient is φ = 1506117808992.

The previous prime is 1631627626417. The next prime is 1631627626457. The reversal of 1631627626421 is 1246267261361.

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 365316283396 + 1266311343025 = 604414^2 + 1125305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631627626421 - 2² = 1631627626417 is a prime.

It is a super-2 number, since 2×1631627626421² (a number of 25 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 (1631627626021) 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, 62754908696 + ... + 62754908721.

It is an arithmetic number, because the mean of its divisors is an integer number (439284360963).

Almost surely, 2^{1631627626421} is an apocalyptic number.

It is an amenable number.

1631627626421 is a deficient number, since it is larger than the sum of its proper divisors (125509817431).

1631627626421 is a wasteful number, since it uses less digits than its factorization.

1631627626421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125509817430.

The product of its digits is 870912, while the sum is 47.

The spelling of 1631627626421 in words is "one trillion, six hundred thirty-one billion, six hundred twenty-seven million, six hundred twenty-six thousand, four hundred twenty-one".