61557770506 has 8 divisors (see below), whose sum is σ = 94301265600. Its totient is φ = 30124015308.

The previous prime is 61557770501. The next prime is 61557770509. The reversal of 61557770506 is 60507775516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 61557770506.

It is not an unprimeable number, because it can be changed into a prime (61557770501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327434856 + ... + 327435043.

It is an arithmetic number, because the mean of its divisors is an integer number (11787658200).

Almost surely, 2^61557770506 is an apocalyptic number.

61557770506 is a deficient number, since it is larger than the sum of its proper divisors (32743495094).

61557770506 is a wasteful number, since it uses less digits than its factorization.

61557770506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654869948.

The product of its (nonzero) digits is 1543500, while the sum is 49.

The spelling of 61557770506 in words is "sixty-one billion, five hundred fifty-seven million, seven hundred seventy thousand, five hundred six".