61531416215 has 16 divisors (see below), whose sum is σ = 74889126720. Its totient is φ = 48524394240.

The previous prime is 61531416211. The next prime is 61531416257. The reversal of 61531416215 is 51261413516.

It is not a de Polignac number, because 61531416215 - 2² = 61531416211 is a prime.

It is a super-2 number, since 2×61531416215² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61531416211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4130801 + ... + 4145669.

It is an arithmetic number, because the mean of its divisors is an integer number (4680570420).

Almost surely, 2^61531416215 is an apocalyptic number.

61531416215 is a deficient number, since it is larger than the sum of its proper divisors (13357710505).

61531416215 is a wasteful number, since it uses less digits than its factorization.

61531416215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26602.

The product of its digits is 21600, while the sum is 35.

The spelling of 61531416215 in words is "sixty-one billion, five hundred thirty-one million, four hundred sixteen thousand, two hundred fifteen".