70631398656 has 504 divisors, whose sum is σ = 260227036160. Its totient is φ = 18623582208.

The previous prime is 70631398633. The next prime is 70631398693. The reversal of 70631398656 is 65689313607.

It is a tau number, because it is divible by the number of its divisors (504).

It is a super-2 number, since 2×70631398656² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 16980705 + ... + 16984863.

Almost surely, 2^70631398656 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 70631398656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130113518080).

70631398656 is an abundant number, since it is smaller than the sum of its proper divisors (189595637504).

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

70631398656 is an equidigital number, since it uses as much as digits as its factorization.

70631398656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4213 (or 4184 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 54.

The spelling of 70631398656 in words is "seventy billion, six hundred thirty-one million, three hundred ninety-eight thousand, six hundred fifty-six".