61562556521 has 8 divisors (see below), whose sum is σ = 61943071680. Its totient is φ = 61182183088.

The previous prime is 61562556491. The next prime is 61562556527. The reversal of 61562556521 is 12565526516.

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 61562556521 - 2³⁴ = 44382687337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61562556527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 914210 + ... + 979236.

It is an arithmetic number, because the mean of its divisors is an integer number (7742883960).

Almost surely, 2^61562556521 is an apocalyptic number.

It is an amenable number.

61562556521 is a deficient number, since it is larger than the sum of its proper divisors (380515159).

61562556521 is a wasteful number, since it uses less digits than its factorization.

61562556521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70863.

The product of its digits is 540000, while the sum is 44.

The spelling of 61562556521 in words is "sixty-one billion, five hundred sixty-two million, five hundred fifty-six thousand, five hundred twenty-one".