7388639661 has 16 divisors (see below), whose sum is σ = 10619598080. Its totient is φ = 4542454080.

The previous prime is 7388639639. The next prime is 7388639707. The reversal of 7388639661 is 1669368837.

It is not a de Polignac number, because 7388639661 - 2¹⁰ = 7388638637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7388632661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50650 + ... + 131691.

It is an arithmetic number, because the mean of its divisors is an integer number (663724880).

Almost surely, 2^7388639661 is an apocalyptic number.

It is an amenable number.

7388639661 is a deficient number, since it is larger than the sum of its proper divisors (3230958419).

7388639661 is a wasteful number, since it uses less digits than its factorization.

7388639661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183396.

The product of its digits is 7838208, while the sum is 57.

The square root of 7388639661 is about 85957.1966795102. The cubic root of 7388639661 is about 1947.6974497517.

The spelling of 7388639661 in words is "seven billion, three hundred eighty-eight million, six hundred thirty-nine thousand, six hundred sixty-one".