61943063661 has 18 divisors (see below), whose sum is σ = 92909884782. Its totient is φ = 41295371400.

The previous prime is 61943063657. The next prime is 61943063681. The reversal of 61943063661 is 16636034916.

61943063661 is a `hidden beast` number, since 6 + 1 + 9 + 4 + 3 + 0 + 636 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 38901645225 + 23041418436 = 197235^2 + 151794^2 .

It is not a de Polignac number, because 61943063661 - 2² = 61943063657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61943063681) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4713990 + ... + 4727111.

Almost surely, 2^61943063661 is an apocalyptic number.

It is an amenable number.

61943063661 is a deficient number, since it is larger than the sum of its proper divisors (30966821121).

61943063661 is an frugal number, since it uses more digits than its factorization.

61943063661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9441125 (or 9441104 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The spelling of 61943063661 in words is "sixty-one billion, nine hundred forty-three million, sixty-three thousand, six hundred sixty-one".