138778490530690 has 32 divisors (see below), whose sum is σ = 258284198744064. Its totient is φ = 53632203952320.

The previous prime is 138778490530679. The next prime is 138778490530727. The reversal of 138778490530690 is 96035094877831.

It is a super-2 number, since 2×138778490530690² (a number of 29 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (70) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 368570109 + ... + 368946448.

It is an arithmetic number, because the mean of its divisors is an integer number (8071381210752).

Almost surely, 2^{138778490530690} is an apocalyptic number.

138778490530690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138778490530690 is a deficient number, since it is larger than the sum of its proper divisors (119505708213374).

138778490530690 is a wasteful number, since it uses less digits than its factorization.

138778490530690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737517202.

The product of its (nonzero) digits is 274337280, while the sum is 70.

The spelling of 138778490530690 in words is "one hundred thirty-eight trillion, seven hundred seventy-eight billion, four hundred ninety million, five hundred thirty thousand, six hundred ninety".