61615563156 has 144 divisors (see below), whose sum is σ = 180077963520. Its totient is φ = 17400199680.

The previous prime is 61615563131. The next prime is 61615563169. The reversal of 61615563156 is 65136551616.

61615563156 is a `hidden beast` number, since 6 + 1 + 6 + 1 + 5 + 5 + 631 + 5 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7613160 + ... + 7621248.

Almost surely, 2^61615563156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61615563156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90038981760).

61615563156 is an abundant number, since it is smaller than the sum of its proper divisors (118462400364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61615563156 is a wasteful number, since it uses less digits than its factorization.

61615563156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8454 (or 8449 counting only the distinct ones).

The product of its digits is 486000, while the sum is 45.

The spelling of 61615563156 in words is "sixty-one billion, six hundred fifteen million, five hundred sixty-three thousand, one hundred fifty-six".