61566505501 has 8 divisors (see below), whose sum is σ = 64523854080. Its totient is φ = 58632535632.

The previous prime is 61566505493. The next prime is 61566505519. The reversal of 61566505501 is 10550566516.

61566505501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 61566505501 - 2³ = 61566505493 is a prime.

It is a super-2 number, since 2×61566505501² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61566535501) 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, 5839285 + ... + 5849818.

It is an arithmetic number, because the mean of its divisors is an integer number (8065481760).

Almost surely, 2^61566505501 is an apocalyptic number.

It is an amenable number.

61566505501 is a deficient number, since it is larger than the sum of its proper divisors (2957348579).

61566505501 is a wasteful number, since it uses less digits than its factorization.

61566505501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11689355.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 61566505501 in words is "sixty-one billion, five hundred sixty-six million, five hundred five thousand, five hundred one".