61329296815 has 16 divisors (see below), whose sum is σ = 78015728448. Its totient is φ = 46123163136.

The previous prime is 61329296731. The next prime is 61329296839. The reversal of 61329296815 is 51869292316.

It is a cyclic number.

It is not a de Polignac number, because 61329296815 - 2¹⁷ = 61329165743 is a prime.

It is a super-2 number, since 2×61329296815² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 350427 + ... + 495436.

It is an arithmetic number, because the mean of its divisors is an integer number (4875983028).

Almost surely, 2^61329296815 is an apocalyptic number.

61329296815 is a deficient number, since it is larger than the sum of its proper divisors (16686431633).

61329296815 is a wasteful number, since it uses less digits than its factorization.

61329296815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846738.

The product of its digits is 1399680, while the sum is 52.

The spelling of 61329296815 in words is "sixty-one billion, three hundred twenty-nine million, two hundred ninety-six thousand, eight hundred fifteen".