61616541997 has 16 divisors (see below), whose sum is σ = 64351683072. Its totient is φ = 58931976960.

The previous prime is 61616541979. The next prime is 61616542003. The reversal of 61616541997 is 79914561616.

It is a cyclic number.

It is not a de Polignac number, because 61616541997 - 2⁷ = 61616541869 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 (61616541907) 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 15 ways as a sum of consecutive naturals, for example, 932113 + ... + 996025.

It is an arithmetic number, because the mean of its divisors is an integer number (4021980192).

Almost surely, 2^61616541997 is an apocalyptic number.

It is an amenable number.

61616541997 is a deficient number, since it is larger than the sum of its proper divisors (2735141075).

61616541997 is a wasteful number, since it uses less digits than its factorization.

61616541997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64308.

The product of its digits is 2449440, while the sum is 55.

The spelling of 61616541997 in words is "sixty-one billion, six hundred sixteen million, five hundred forty-one thousand, nine hundred ninety-seven".