12507661478 has 16 divisors (see below), whose sum is σ = 20222286336. Its totient is φ = 5767737600.

The previous prime is 12507661429. The next prime is 12507661483. The reversal of 12507661478 is 87416670521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179051 + ... + 238902.

It is an arithmetic number, because the mean of its divisors is an integer number (1263892896).

Almost surely, 2^12507661478 is an apocalyptic number.

12507661478 is a deficient number, since it is larger than the sum of its proper divisors (7714624858).

12507661478 is a wasteful number, since it uses less digits than its factorization.

12507661478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419119.

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 12507661478 in words is "twelve billion, five hundred seven million, six hundred sixty-one thousand, four hundred seventy-eight".