618495471561 has 16 divisors (see below), whose sum is σ = 901210875840. Its totient is φ = 374186949120.

The previous prime is 618495471497. The next prime is 618495471661. The reversal of 618495471561 is 165174594816.

It is not a de Polignac number, because 618495471561 - 2⁶ = 618495471497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (618495471661) 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, 16450720 + ... + 16488273.

It is an arithmetic number, because the mean of its divisors is an integer number (56325679740).

Almost surely, 2^618495471561 is an apocalyptic number.

It is an amenable number.

618495471561 is a deficient number, since it is larger than the sum of its proper divisors (282715404279).

618495471561 is a wasteful number, since it uses less digits than its factorization.

618495471561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32939576.

The product of its digits is 7257600, while the sum is 57.

The spelling of 618495471561 in words is "six hundred eighteen billion, four hundred ninety-five million, four hundred seventy-one thousand, five hundred sixty-one".