61051620505556 has 12 divisors (see below), whose sum is σ = 108591816801300. Its totient is φ = 30025387133760.

The previous prime is 61051620505553. The next prime is 61051620505559. The reversal of 61051620505556 is 65550502615016.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61051620505553) and next prime (61051620505559).

It can be written as a sum of positive squares in 2 ways, for example, as 12079336585156 + 48972283920400 = 3475534^2 + 6998020^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61051620505556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61051620505553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125105779481 + ... + 125105779968.

It is an arithmetic number, because the mean of its divisors is an integer number (9049318066775).

Almost surely, 2^{61051620505556} is an apocalyptic number.

It is an amenable number.

61051620505556 is a deficient number, since it is larger than the sum of its proper divisors (47540196295744).

61051620505556 is a wasteful number, since it uses less digits than its factorization.

61051620505556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250211559514 (or 250211559512 counting only the distinct ones).

The product of its (nonzero) digits is 1350000, while the sum is 47.

The spelling of 61051620505556 in words is "sixty-one trillion, fifty-one billion, six hundred twenty million, five hundred five thousand, five hundred fifty-six".