15661543015 has 16 divisors (see below), whose sum is σ = 19418593536. Its totient is φ = 12113510400.

The previous prime is 15661542997. The next prime is 15661543043. The reversal of 15661543015 is 51034516651.

It is not a de Polignac number, because 15661543015 - 2²⁷ = 15527325287 is a prime.

It is a super-2 number, since 2×15661543015² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

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, 116839 + ... + 212071.

It is an arithmetic number, because the mean of its divisors is an integer number (1213662096).

Almost surely, 2^15661543015 is an apocalyptic number.

15661543015 is a deficient number, since it is larger than the sum of its proper divisors (3757050521).

15661543015 is a wasteful number, since it uses less digits than its factorization.

15661543015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96330.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 15661543015 in words is "fifteen billion, six hundred sixty-one million, five hundred forty-three thousand, fifteen".