15642422506 has 4 divisors (see below), whose sum is σ = 23463633762. Its totient is φ = 7821211252.

The previous prime is 15642422479. The next prime is 15642422507. The reversal of 15642422506 is 60522424651.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 9371208025 + 6271214481 = 96805^2 + 79191^2 .

It is not an unprimeable number, because it can be changed into a prime (15642422507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3910605625 + ... + 3910605628.

Almost surely, 2^15642422506 is an apocalyptic number.

15642422506 is a deficient number, since it is larger than the sum of its proper divisors (7821211256).

15642422506 is an equidigital number, since it uses as much as digits as its factorization.

15642422506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7821211255.

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 15642422506 in words is "fifteen billion, six hundred forty-two million, four hundred twenty-two thousand, five hundred six".