621378146631 has 24 divisors (see below), whose sum is σ = 928910674944. Its totient is φ = 366414605280.

The previous prime is 621378146617. The next prime is 621378146659. The reversal of 621378146631 is 136641873126.

It is a happy number.

It is not a de Polignac number, because 621378146631 - 2⁹ = 621378146119 is a prime.

It is a super-2 number, since 2×621378146631² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621378146671) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6831975 + ... + 6922328.

It is an arithmetic number, because the mean of its divisors is an integer number (38704611456).

Almost surely, 2^621378146631 is an apocalyptic number.

621378146631 is a deficient number, since it is larger than the sum of its proper divisors (307532528313).

621378146631 is a wasteful number, since it uses less digits than its factorization.

621378146631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13754391 (or 13754354 counting only the distinct ones).

The product of its digits is 870912, while the sum is 48.

The spelling of 621378146631 in words is "six hundred twenty-one billion, three hundred seventy-eight million, one hundred forty-six thousand, six hundred thirty-one".