15661083485 has 16 divisors (see below), whose sum is σ = 20081358000. Its totient is φ = 11683685376.

The previous prime is 15661083461. The next prime is 15661083497. The reversal of 15661083485 is 58438016651.

It can be written as a sum of positive squares in 8 ways, for example, as 44582329 + 15616501156 = 6677^2 + 124966^2 .

It is a cyclic number.

It is not a de Polignac number, because 15661083485 - 2²⁶ = 15593974621 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 835910 + ... + 854439.

It is an arithmetic number, because the mean of its divisors is an integer number (1255084875).

Almost surely, 2^15661083485 is an apocalyptic number.

It is an amenable number.

15661083485 is a deficient number, since it is larger than the sum of its proper divisors (4420274515).

15661083485 is a wasteful number, since it uses less digits than its factorization.

15661083485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690480.

The product of its (nonzero) digits is 691200, while the sum is 47.

The spelling of 15661083485 in words is "fifteen billion, six hundred sixty-one million, eighty-three thousand, four hundred eighty-five".