61602645921 has 4 divisors (see below), whose sum is σ = 82136861232. Its totient is φ = 41068430612.

The previous prime is 61602645889. The next prime is 61602645931. The reversal of 61602645921 is 12954620616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61602645921 - 2⁵ = 61602645889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61602645931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10267107651 + ... + 10267107656.

It is an arithmetic number, because the mean of its divisors is an integer number (20534215308).

Almost surely, 2^61602645921 is an apocalyptic number.

It is an amenable number.

61602645921 is a deficient number, since it is larger than the sum of its proper divisors (20534215311).

61602645921 is a wasteful number, since it uses less digits than its factorization.

61602645921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20534215310.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 61602645921 in words is "sixty-one billion, six hundred two million, six hundred forty-five thousand, nine hundred twenty-one".