61491096576 has 1056 divisors, whose sum is σ = 244633858560. Its totient is φ = 14396424192.

The previous prime is 61491096547. The next prime is 61491096581. The reversal of 61491096576 is 67569019416.

It is a happy number.

61491096576 is a `hidden beast` number, since 61 + 4 + 9 + 1 + 0 + 9 + 6 + 576 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 270885775 + ... + 270886001.

Almost surely, 2^61491096576 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 61491096576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122316929280).

61491096576 is an abundant number, since it is smaller than the sum of its proper divisors (183142761984).

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

61491096576 is a wasteful number, since it uses less digits than its factorization.

61491096576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 61491096576 in words is "sixty-one billion, four hundred ninety-one million, ninety-six thousand, five hundred seventy-six".