621911249136 has 240 divisors, whose sum is σ = 1847041219296. Its totient is φ = 202503794688.

The previous prime is 621911249129. The next prime is 621911249161. The reversal of 621911249136 is 631942119126.

621911249136 is a `hidden beast` number, since 6 + 2 + 19 + 112 + 491 + 36 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 621911249091 and 621911249100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48006436 + ... + 48019388.

Almost surely, 2^621911249136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621911249136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (923520609648).

621911249136 is an abundant number, since it is smaller than the sum of its proper divisors (1225129970160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621911249136 is a wasteful number, since it uses less digits than its factorization.

621911249136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13262 (or 13244 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The spelling of 621911249136 in words is "six hundred twenty-one billion, nine hundred eleven million, two hundred forty-nine thousand, one hundred thirty-six".