61557253116 has 48 divisors (see below), whose sum is σ = 145401110400. Its totient is φ = 20266708032.

The previous prime is 61557253111. The next prime is 61557253141. The reversal of 61557253116 is 61135275516.

It is a super-2 number, since 2×61557253116² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61557253111) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 7634295 + ... + 7642353.

It is an arithmetic number, because the mean of its divisors is an integer number (3029189800).

Almost surely, 2^61557253116 is an apocalyptic number.

It is an amenable number.

61557253116 is an abundant number, since it is smaller than the sum of its proper divisors (83843857284).

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

61557253116 is a wasteful number, since it uses less digits than its factorization.

61557253116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15818 (or 15816 counting only the distinct ones).

The product of its digits is 189000, while the sum is 42.

The spelling of 61557253116 in words is "sixty-one billion, five hundred fifty-seven million, two hundred fifty-three thousand, one hundred sixteen".