61879862709 has 64 divisors (see below), whose sum is σ = 107156736000. Its totient is φ = 35277763248.

The previous prime is 61879862683. The next prime is 61879862731. The reversal of 61879862709 is 90726897816.

61879862709 is a `hidden beast` number, since 618 + 7 + 9 + 8 + 6 + 2 + 7 + 0 + 9 = 666.

It is not a de Polignac number, because 61879862709 - 2¹² = 61879858613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61879862609) 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 63 ways as a sum of consecutive naturals, for example, 4095082 + ... + 4110164.

It is an arithmetic number, because the mean of its divisors is an integer number (1674324000).

Almost surely, 2^61879862709 is an apocalyptic number.

It is an amenable number.

61879862709 is a deficient number, since it is larger than the sum of its proper divisors (45276873291).

61879862709 is a wasteful number, since it uses less digits than its factorization.

61879862709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15556 (or 15536 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 63.

The spelling of 61879862709 in words is "sixty-one billion, eight hundred seventy-nine million, eight hundred sixty-two thousand, seven hundred nine".