61061510515509 has 48 divisors (see below), whose sum is σ = 108809545478400. Its totient is φ = 32224365347328.

The previous prime is 61061510515507. The next prime is 61061510515513. The reversal of 61061510515509 is 90551501516016.

61061510515509 is a `hidden beast` number, since 6 + 1 + 0 + 615 + 10 + 5 + 15 + 5 + 0 + 9 = 666.

It is not a de Polignac number, because 61061510515509 - 2¹ = 61061510515507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61061510515507) 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, 726517444 + ... + 726601485.

It is an arithmetic number, because the mean of its divisors is an integer number (2266865530800).

Almost surely, 2^{61061510515509} is an apocalyptic number.

61061510515509 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

61061510515509 is a deficient number, since it is larger than the sum of its proper divisors (47748034962891).

61061510515509 is a wasteful number, since it uses less digits than its factorization.

61061510515509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453118994 (or 1453118991 counting only the distinct ones).

The product of its (nonzero) digits is 202500, while the sum is 45.

The spelling of 61061510515509 in words is "sixty-one trillion, sixty-one billion, five hundred ten million, five hundred fifteen thousand, five hundred nine".