61554733736 has 8 divisors (see below), whose sum is σ = 115415125770. Its totient is φ = 30777366864.

The previous prime is 61554733727. The next prime is 61554733759. The reversal of 61554733736 is 63733745516.

61554733736 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 58954753636 + 2599980100 = 242806^2 + 50990^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3847170851 + ... + 3847170866.

Almost surely, 2^61554733736 is an apocalyptic number.

It is an amenable number.

61554733736 is a deficient number, since it is larger than the sum of its proper divisors (53860392034).

61554733736 is a wasteful number, since it uses less digits than its factorization.

61554733736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7694341723 (or 7694341719 counting only the distinct ones).

The product of its digits is 4762800, while the sum is 50.

The spelling of 61554733736 in words is "sixty-one billion, five hundred fifty-four million, seven hundred thirty-three thousand, seven hundred thirty-six".