612478320021 has 40 divisors (see below), whose sum is σ = 928829694144. Its totient is φ = 402121843200.

The previous prime is 612478319989. The next prime is 612478320061. The reversal of 612478320021 is 120023874216.

It is a happy number.

612478320021 is a `hidden beast` number, since 612 + 4 + 7 + 8 + 32 + 0 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 612478320021 - 2⁵ = 612478319989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612478320061) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 25348296 + ... + 25372446.

Almost surely, 2^612478320021 is an apocalyptic number.

It is an amenable number.

612478320021 is a deficient number, since it is larger than the sum of its proper divisors (316351374123).

612478320021 is a wasteful number, since it uses less digits than its factorization.

612478320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28903 (or 28894 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 612478320021 in words is "six hundred twelve billion, four hundred seventy-eight million, three hundred twenty thousand, twenty-one".