615531406643656 has 64 divisors (see below), whose sum is σ = 1246906795348080. Its totient is φ = 283776730398720.

The previous prime is 615531406643651. The next prime is 615531406643693. The reversal of 615531406643656 is 656346604135516.

615531406643656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 605350418976900 + 10180987666756 = 24603870^2 + 3190766^2 .

It is a super-3 number, since 3×615531406643656³ (a number of 45 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 615531406643594 and 615531406643603.

It is not an unprimeable number, because it can be changed into a prime (615531406643651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58189305 + ... + 67948936.

Almost surely, 2^{615531406643656} is an apocalyptic number.

It is an amenable number.

615531406643656 is an abundant number, since it is smaller than the sum of its proper divisors (631375388704424).

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

615531406643656 is a wasteful number, since it uses less digits than its factorization.

615531406643656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126138994 (or 126138990 counting only the distinct ones).

The product of its (nonzero) digits is 139968000, while the sum is 61.

The spelling of 615531406643656 in words is "six hundred fifteen trillion, five hundred thirty-one billion, four hundred six million, six hundred forty-three thousand, six hundred fifty-six".