61221410755 has 8 divisors (see below), whose sum is σ = 73559046672. Its totient is φ = 48914892768.

The previous prime is 61221410749. The next prime is 61221410773. The reversal of 61221410755 is 55701412216.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61221410755 - 2²³ = 61213022147 is a prime.

It is a super-2 number, since 2×61221410755² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61221410755.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7775152 + ... + 7783021.

It is an arithmetic number, because the mean of its divisors is an integer number (9194880834).

Almost surely, 2^61221410755 is an apocalyptic number.

61221410755 is a deficient number, since it is larger than the sum of its proper divisors (12337635917).

61221410755 is a wasteful number, since it uses less digits than its factorization.

61221410755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15558965.

The product of its (nonzero) digits is 16800, while the sum is 34.

The spelling of 61221410755 in words is "sixty-one billion, two hundred twenty-one million, four hundred ten thousand, seven hundred fifty-five".