12990394250778 has 64 divisors (see below), whose sum is σ = 30197723397120. Its totient is φ = 3648375896832.

The previous prime is 12990394250747. The next prime is 12990394250783. The reversal of 12990394250778 is 87705249309921.

It is a happy number.

It is a super-2 number, since 2×12990394250778² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36340425 + ... + 36696147.

It is an arithmetic number, because the mean of its divisors is an integer number (471839428080).

Almost surely, 2^{12990394250778} is an apocalyptic number.

12990394250778 is an abundant number, since it is smaller than the sum of its proper divisors (17207329146342).

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

12990394250778 is a wasteful number, since it uses less digits than its factorization.

12990394250778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370531.

The product of its (nonzero) digits is 68584320, while the sum is 66.

The spelling of 12990394250778 in words is "twelve trillion, nine hundred ninety billion, three hundred ninety-four million, two hundred fifty thousand, seven hundred seventy-eight".