61156264021 has 4 divisors (see below), whose sum is σ = 61561272544. Its totient is φ = 60751255500.

The previous prime is 61156264019. The next prime is 61156264027. The reversal of 61156264021 is 12046265116.

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 61156264021 - 2¹ = 61156264019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61156264027) 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, 202504035 + ... + 202504336.

It is an arithmetic number, because the mean of its divisors is an integer number (15390318136).

Almost surely, 2^61156264021 is an apocalyptic number.

It is an amenable number.

61156264021 is a deficient number, since it is larger than the sum of its proper divisors (405008523).

61156264021 is a wasteful number, since it uses less digits than its factorization.

61156264021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405008522.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 61156264021 in words is "sixty-one billion, one hundred fifty-six million, two hundred sixty-four thousand, twenty-one".