61991857047 has 8 divisors (see below), whose sum is σ = 85506009840. Its totient is φ = 39902804480.

The previous prime is 61991857027. The next prime is 61991857069. The reversal of 61991857047 is 74075819916.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61991857047 - 2¹⁰ = 61991856023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61991857027) 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 7 ways as a sum of consecutive naturals, for example, 356274954 + ... + 356275127.

It is an arithmetic number, because the mean of its divisors is an integer number (10688251230).

Almost surely, 2^61991857047 is an apocalyptic number.

61991857047 is a deficient number, since it is larger than the sum of its proper divisors (23514152793).

61991857047 is a wasteful number, since it uses less digits than its factorization.

61991857047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712550113.

The product of its (nonzero) digits is 3810240, while the sum is 57.

The spelling of 61991857047 in words is "sixty-one billion, nine hundred ninety-one million, eight hundred fifty-seven thousand, forty-seven".