61159943956 has 12 divisors (see below), whose sum is σ = 107041103092. Its totient is φ = 30576771648.

The previous prime is 61159943953. The next prime is 61159943963. The reversal of 61159943956 is 65934995116.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 38769610000 + 22390333956 = 196900^2 + 149634^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61159943956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61159943951) 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, 756825 + ... + 833728.

Almost surely, 2^61159943956 is an apocalyptic number.

It is an amenable number.

61159943956 is a deficient number, since it is larger than the sum of its proper divisors (45881159136).

61159943956 is a wasteful number, since it uses less digits than its factorization.

61159943956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600170 (or 1600168 counting only the distinct ones).

The product of its digits is 7873200, while the sum is 58.

The spelling of 61159943956 in words is "sixty-one billion, one hundred fifty-nine million, nine hundred forty-three thousand, nine hundred fifty-six".