615061665561 has 48 divisors (see below), whose sum is σ = 973352903040. Its totient is φ = 344395699200.

The previous prime is 615061665551. The next prime is 615061665577. The reversal of 615061665561 is 165566160516.

It is not a de Polignac number, because 615061665561 - 2⁷ = 615061665433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 615061665561.

It is not an unprimeable number, because it can be changed into a prime (615061665551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1226620 + ... + 1653698.

It is an arithmetic number, because the mean of its divisors is an integer number (20278185480).

Almost surely, 2^615061665561 is an apocalyptic number.

It is an amenable number.

615061665561 is a deficient number, since it is larger than the sum of its proper divisors (358291237479).

615061665561 is a wasteful number, since it uses less digits than its factorization.

615061665561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427294 (or 427287 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 615061665561 in words is "six hundred fifteen billion, sixty-one million, six hundred sixty-five thousand, five hundred sixty-one".