15550150661 has 4 divisors (see below), whose sum is σ = 16226244192. Its totient is φ = 14874057132.

The previous prime is 15550150633. The next prime is 15550150663. The reversal of 15550150661 is 16605105551.

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 a de Polignac number, because none of the positive numbers 2^k-15550150661 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 (15550150663) 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, 338046731 + ... + 338046776.

It is an arithmetic number, because the mean of its divisors is an integer number (4056561048).

Almost surely, 2^15550150661 is an apocalyptic number.

It is an amenable number.

15550150661 is a deficient number, since it is larger than the sum of its proper divisors (676093531).

15550150661 is an equidigital number, since it uses as much as digits as its factorization.

15550150661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676093530.

The product of its (nonzero) digits is 22500, while the sum is 35.

The spelling of 15550150661 in words is "fifteen billion, five hundred fifty million, one hundred fifty thousand, six hundred sixty-one".