11207151661 has 4 divisors (see below), whose sum is σ = 11208778812. Its totient is φ = 11205524512.

The previous prime is 11207151647. The next prime is 11207151677. The reversal of 11207151661 is 16615170211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3792219561 + 7414932100 = 61581^2 + 86110^2 .

It is a cyclic number.

It is not a de Polignac number, because 11207151661 - 2¹⁵ = 11207118893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11207151061) 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, 803200 + ... + 817033.

It is an arithmetic number, because the mean of its divisors is an integer number (2802194703).

Almost surely, 2^11207151661 is an apocalyptic number.

It is an amenable number.

11207151661 is a deficient number, since it is larger than the sum of its proper divisors (1627151).

11207151661 is an equidigital number, since it uses as much as digits as its factorization.

11207151661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627150.

The product of its (nonzero) digits is 2520, while the sum is 31.

The spelling of 11207151661 in words is "eleven billion, two hundred seven million, one hundred fifty-one thousand, six hundred sixty-one".