615401660135256 has 256 divisors, whose sum is σ = 1618495495372800. Its totient is φ = 194739553382400.

The previous prime is 615401660135243. The next prime is 615401660135257. The reversal of 615401660135256 is 652531066104516.

It is a junction number, because it is equal to n+sod(n) for n = 615401660135199 and 615401660135208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (615401660135257) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26515635780 + ... + 26515658988.

It is an arithmetic number, because the mean of its divisors is an integer number (6322248028800).

Almost surely, 2^{615401660135256} 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 615401660135256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (809247747686400).

615401660135256 is an abundant number, since it is smaller than the sum of its proper divisors (1003093835237544).

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

615401660135256 is a wasteful number, since it uses less digits than its factorization.

615401660135256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24850 (or 24846 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 51.

The spelling of 615401660135256 in words is "six hundred fifteen trillion, four hundred one billion, six hundred sixty million, one hundred thirty-five thousand, two hundred fifty-six".