61165155515 has 4 divisors (see below), whose sum is σ = 73398186624. Its totient is φ = 48932124408.

The previous prime is 61165155481. The next prime is 61165155517. The reversal of 61165155515 is 51555156116.

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 61165155515 - 2¹⁸ = 61164893371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61165155517) 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, 6116515547 + ... + 6116515556.

It is an arithmetic number, because the mean of its divisors is an integer number (18349546656).

Almost surely, 2^61165155515 is an apocalyptic number.

61165155515 is a deficient number, since it is larger than the sum of its proper divisors (12233031109).

61165155515 is a wasteful number, since it uses less digits than its factorization.

61165155515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12233031108.

The product of its digits is 112500, while the sum is 41.

The spelling of 61165155515 in words is "sixty-one billion, one hundred sixty-five million, one hundred fifty-five thousand, five hundred fifteen".