61550665516 has 24 divisors (see below), whose sum is σ = 114788298240. Its totient is φ = 28810947792.

The previous prime is 61550665499. The next prime is 61550665529. The reversal of 61550665516 is 61556605516.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7113006 + ... + 7121653.

It is an arithmetic number, because the mean of its divisors is an integer number (4782845760).

Almost surely, 2^61550665516 is an apocalyptic number.

It is an amenable number.

61550665516 is a deficient number, since it is larger than the sum of its proper divisors (53237632724).

61550665516 is a wasteful number, since it uses less digits than its factorization.

61550665516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14234733 (or 14234731 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 61550665516 in words is "sixty-one billion, five hundred fifty million, six hundred sixty-five thousand, five hundred sixteen".