15620001661 has 32 divisors (see below), whose sum is σ = 18108769536. Its totient is φ = 13333056000.

The previous prime is 15620001623. The next prime is 15620001697. The reversal of 15620001661 is 16610002651.

It is not a de Polignac number, because 15620001661 - 2⁷ = 15620001533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15620001611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13225491 + ... + 13226671.

It is an arithmetic number, because the mean of its divisors is an integer number (565899048).

Almost surely, 2^15620001661 is an apocalyptic number.

15620001661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15620001661 is a deficient number, since it is larger than the sum of its proper divisors (2488767875).

15620001661 is a wasteful number, since it uses less digits than its factorization.

15620001661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133.

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 15620001661 in words is "fifteen billion, six hundred twenty million, one thousand, six hundred sixty-one".