615531406644055 has 8 divisors (see below), whose sum is σ = 805786568697744. Its totient is φ = 447659204832000.

The previous prime is 615531406644031. The next prime is 615531406644079. The reversal of 615531406644055 is 550446604135516.

It is an interprime number because it is at equal distance from previous prime (615531406644031) and next prime (615531406644079).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 615531406644055 - 2¹³ = 615531406635863 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55), and also a Moran number because the ratio is a prime number: 11191480120801 = 615531406644055 / (6 + 1 + 5 + 5 + 3 + 1 + 4 + 0 + 6 + 6 + 4 + 4 + 0 + 5 + 5).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 615531406643987 and 615531406644005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5595740060346 + ... + 5595740060455.

It is an arithmetic number, because the mean of its divisors is an integer number (100723321087218).

Almost surely, 2^{615531406644055} is an apocalyptic number.

615531406644055 is a deficient number, since it is larger than the sum of its proper divisors (190255162053689).

615531406644055 is a wasteful number, since it uses less digits than its factorization.

615531406644055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11191480120817.

The product of its (nonzero) digits is 25920000, while the sum is 55.

The spelling of 615531406644055 in words is "six hundred fifteen trillion, five hundred thirty-one billion, four hundred six million, six hundred forty-four thousand, fifty-five".