3868770352561 has 27 divisors (see below), whose sum is σ = 4062441098457. Its totient is φ = 3684196640520.

The previous prime is 3868770352529. The next prime is 3868770352613. The reversal of 3868770352561 is 1652530778683.

The square root of 3868770352561 is 1966919.

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

It is not a de Polignac number, because 3868770352561 - 2⁵ = 3868770352529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3868770352561.

It is not an unprimeable number, because it can be changed into a prime (3868770352501) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4085290290 + ... + 4085291236.

Almost surely, 2^{3868770352561} is an apocalyptic number.

3868770352561 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

3868770352561 is the 1966919-th square number.

3868770352561 is the 983460-th centered octagonal number.

It is an amenable number.

3868770352561 is a deficient number, since it is larger than the sum of its proper divisors (193670745896).

3868770352561 is an frugal number, since it uses more digits than its factorization.

3868770352561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090 (or 1045 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 61.

The spelling of 3868770352561 in words is "three trillion, eight hundred sixty-eight billion, seven hundred seventy million, three hundred fifty-two thousand, five hundred sixty-one".