615455561131 has 4 divisors (see below), whose sum is σ = 628550360352. Its totient is φ = 602360761912.

The previous prime is 615455561113. The next prime is 615455561173. The reversal of 615455561131 is 131165554516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 615455561131 - 2⁹ = 615455560619 is a prime.

It is a super-2 number, since 2×615455561131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (615455561111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6547399540 + ... + 6547399633.

It is an arithmetic number, because the mean of its divisors is an integer number (157137590088).

Almost surely, 2^615455561131 is an apocalyptic number.

615455561131 is a deficient number, since it is larger than the sum of its proper divisors (13094799221).

615455561131 is a wasteful number, since it uses less digits than its factorization.

615455561131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13094799220.

The product of its digits is 270000, while the sum is 43.

The spelling of 615455561131 in words is "six hundred fifteen billion, four hundred fifty-five million, five hundred sixty-one thousand, one hundred thirty-one".