61159211720 has 32 divisors (see below), whose sum is σ = 144850766400. Its totient is φ = 23176122048.

The previous prime is 61159211693. The next prime is 61159211761. The reversal of 61159211720 is 2711295116.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40235564 + ... + 40237083.

It is an arithmetic number, because the mean of its divisors is an integer number (4526586450).

Almost surely, 2^61159211720 is an apocalyptic number.

It is an amenable number.

61159211720 is an abundant number, since it is smaller than the sum of its proper divisors (83691554680).

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

61159211720 is a wasteful number, since it uses less digits than its factorization.

61159211720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80472677 (or 80472673 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 35.

The spelling of 61159211720 in words is "sixty-one billion, one hundred fifty-nine million, two hundred eleven thousand, seven hundred twenty".