61691592312 has 144 divisors (see below), whose sum is σ = 202810692240. Its totient is φ = 16859791872.

The previous prime is 61691592311. The next prime is 61691592329. The reversal of 61691592312 is 21329519616.

61691592312 is a `hidden beast` number, since 616 + 9 + 1 + 5 + 9 + 23 + 1 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61691592311) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 298993 + ... + 461280.

It is an arithmetic number, because the mean of its divisors is an integer number (1408407585).

Almost surely, 2^61691592312 is an apocalyptic number.

It is an amenable number.

61691592312 is an abundant number, since it is smaller than the sum of its proper divisors (141119099928).

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

61691592312 is a wasteful number, since it uses less digits than its factorization.

61691592312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760322 (or 760308 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The spelling of 61691592312 in words is "sixty-one billion, six hundred ninety-one million, five hundred ninety-two thousand, three hundred twelve".