61191453612 has 48 divisors (see below), whose sum is σ = 143694270720. Its totient is φ = 20266953408.

The previous prime is 61191453593. The next prime is 61191453613. The reversal of 61191453612 is 21635419116.

It is not an unprimeable number, because it can be changed into a prime (61191453613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1202763 + ... + 1252605.

It is an arithmetic number, because the mean of its divisors is an integer number (2993630640).

Almost surely, 2^61191453612 is an apocalyptic number.

It is an amenable number.

61191453612 is an abundant number, since it is smaller than the sum of its proper divisors (82502817108).

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

61191453612 is a wasteful number, since it uses less digits than its factorization.

61191453612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50502 (or 50500 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The spelling of 61191453612 in words is "sixty-one billion, one hundred ninety-one million, four hundred fifty-three thousand, six hundred twelve".