139661684978 has 8 divisors (see below), whose sum is σ = 221815617372. Its totient is φ = 65723145856.

The previous prime is 139661684969. The next prime is 139661685047. The reversal of 139661684978 is 879486166931.

It can be written as a sum of positive squares in 2 ways, for example, as 130477721089 + 9183963889 = 361217^2 + 95833^2 .

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

It is a super-2 number, since 2×139661684978² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2053848275 + ... + 2053848342.

Almost surely, 2^139661684978 is an apocalyptic number.

139661684978 is a deficient number, since it is larger than the sum of its proper divisors (82153932394).

139661684978 is a wasteful number, since it uses less digits than its factorization.

139661684978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4107696636.

The product of its digits is 94058496, while the sum is 68.

The spelling of 139661684978 in words is "one hundred thirty-nine billion, six hundred sixty-one million, six hundred eighty-four thousand, nine hundred seventy-eight".