1372106661 has 4 divisors (see below), whose sum is σ = 1829475552. Its totient is φ = 914737772.

The previous prime is 1372106639. The next prime is 1372106663. The reversal of 1372106661 is 1666012731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1372106661 - 2²⁶ = 1304997797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1372106663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228684441 + ... + 228684446.

It is an arithmetic number, because the mean of its divisors is an integer number (457368888).

Almost surely, 2^1372106661 is an apocalyptic number.

It is an amenable number.

1372106661 is a deficient number, since it is larger than the sum of its proper divisors (457368891).

1372106661 is an equidigital number, since it uses as much as digits as its factorization.

1372106661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457368890.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 1372106661 is about 37041.9581150889. The cubic root of 1372106661 is about 1111.2095304927.

The spelling of 1372106661 in words is "one billion, three hundred seventy-two million, one hundred six thousand, six hundred sixty-one".