61215562051 has 4 divisors (see below), whose sum is σ = 69960642352. Its totient is φ = 52470481752.

The previous prime is 61215562043. The next prime is 61215562139. The reversal of 61215562051 is 15026551216.

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 61215562051 - 2³ = 61215562043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61215561998 and 61215562016.

It is not an unprimeable number, because it can be changed into a prime (61215562651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4372540140 + ... + 4372540153.

It is an arithmetic number, because the mean of its divisors is an integer number (17490160588).

Almost surely, 2^61215562051 is an apocalyptic number.

61215562051 is a deficient number, since it is larger than the sum of its proper divisors (8745080301).

61215562051 is an equidigital number, since it uses as much as digits as its factorization.

61215562051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8745080300.

The product of its (nonzero) digits is 18000, while the sum is 34.

The spelling of 61215562051 in words is "sixty-one billion, two hundred fifteen million, five hundred sixty-two thousand, fifty-one".