61153548972 has 72 divisors (see below), whose sum is σ = 148524779760. Its totient is φ = 19560643200.

The previous prime is 61153548949. The next prime is 61153548997. The reversal of 61153548972 is 27984535116.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9702222 + ... + 9708522.

Almost surely, 2^61153548972 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 61153548972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74262389880).

61153548972 is an abundant number, since it is smaller than the sum of its proper divisors (87371230788).

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

61153548972 is a wasteful number, since it uses less digits than its factorization.

61153548972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6671 (or 6502 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 51.

The spelling of 61153548972 in words is "sixty-one billion, one hundred fifty-three million, five hundred forty-eight thousand, nine hundred seventy-two".