61156056225021 has 4 divisors (see below), whose sum is σ = 81541408300032. Its totient is φ = 40770704150012.

The previous prime is 61156056225013. The next prime is 61156056225049. The reversal of 61156056225021 is 12052265065116.

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 61156056225021 - 2³ = 61156056225013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61156056223021) 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, 10192676037501 + ... + 10192676037506.

It is an arithmetic number, because the mean of its divisors is an integer number (20385352075008).

Almost surely, 2^{61156056225021} is an apocalyptic number.

It is an amenable number.

61156056225021 is a deficient number, since it is larger than the sum of its proper divisors (20385352075011).

61156056225021 is a wasteful number, since it uses less digits than its factorization.

61156056225021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20385352075010.

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 61156056225021 in words is "sixty-one trillion, one hundred fifty-six billion, fifty-six million, two hundred twenty-five thousand, twenty-one".