346142778921 has 15 divisors (see below), whose sum is σ = 517085394573. Its totient is φ = 230758322580.

The previous prime is 346142778901. The next prime is 346142778979. The reversal of 346142778921 is 129877241643.

The square root of 346142778921 is 588339.

It is a perfect power (a square), and thus also a powerful number.

346142778921 is a `hidden beast` number, since 3 + 4 + 61 + 427 + 78 + 92 + 1 = 666.

It is not a de Polignac number, because 346142778921 - 2²⁹ = 345605908009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (346142778901) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 5262366 + ... + 5327736.

Almost surely, 2^346142778921 is an apocalyptic number.

346142778921 is the 588339-th square number.

346142778921 is the 294170-th centered octagonal number.

It is an amenable number.

346142778921 is a deficient number, since it is larger than the sum of its proper divisors (170942615652).

346142778921 is an frugal number, since it uses more digits than its factorization.

346142778921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130754 (or 65374 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The spelling of 346142778921 in words is "three hundred forty-six billion, one hundred forty-two million, seven hundred seventy-eight thousand, nine hundred twenty-one".