61999008015 has 128 divisors (see below), whose sum is σ = 121788334080. Its totient is φ = 26303961600.

The previous prime is 61999008011. The next prime is 61999008017. The reversal of 61999008015 is 51080099916.

It is a Cunningham number, because it is equal to 248996²-1.

It is not a de Polignac number, because 61999008015 - 2² = 61999008011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61999008011) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 23653405 + ... + 23656025.

It is an arithmetic number, because the mean of its divisors is an integer number (951471360).

Almost surely, 2^61999008015 is an apocalyptic number.

61999008015 is a deficient number, since it is larger than the sum of its proper divisors (59789326065).

61999008015 is a wasteful number, since it uses less digits than its factorization.

61999008015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2893.

The product of its (nonzero) digits is 174960, while the sum is 48.

The spelling of 61999008015 in words is "sixty-one billion, nine hundred ninety-nine million, eight thousand, fifteen".