61299633218955 has 16 divisors (see below), whose sum is σ = 98080195883040. Its totient is φ = 32692876805888.

The previous prime is 61299633218897. The next prime is 61299633219059. The reversal of 61299633218955 is 55981233699216.

It is a cyclic number.

It is not a de Polignac number, because 61299633218955 - 2⁷ = 61299633218827 is a prime.

It is a super-2 number, since 2×61299633218955² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61299633218955.

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, 14357202 + ... + 18130871.

It is an arithmetic number, because the mean of its divisors is an integer number (6130012242690).

Almost surely, 2^{61299633218955} is an apocalyptic number.

61299633218955 is a deficient number, since it is larger than the sum of its proper divisors (36780562664085).

61299633218955 is a wasteful number, since it uses less digits than its factorization.

61299633218955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32613870.

The product of its digits is 188956800, while the sum is 69.

The spelling of 61299633218955 in words is "sixty-one trillion, two hundred ninety-nine billion, six hundred thirty-three million, two hundred eighteen thousand, nine hundred fifty-five".