15510000051605 has 4 divisors (see below), whose sum is σ = 18612000061932. Its totient is φ = 12408000041280.

The previous prime is 15510000051593. The next prime is 15510000051661. The reversal of 15510000051605 is 50615000001551.

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 2 ways, for example, as 10789957027249 + 4720043024356 = 3284807^2 + 2172566^2 .

It is not a de Polignac number, because 15510000051605 - 2¹⁴ = 15510000035221 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 1551000005156 + ... + 1551000005165.

It is an arithmetic number, because the mean of its divisors is an integer number (4653000015483).

Almost surely, 2^{15510000051605} is an apocalyptic number.

It is an amenable number.

15510000051605 is a deficient number, since it is larger than the sum of its proper divisors (3102000010327).

15510000051605 is an equidigital number, since it uses as much as digits as its factorization.

15510000051605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3102000010326.

The product of its (nonzero) digits is 3750, while the sum is 29.

The spelling of 15510000051605 in words is "fifteen trillion, five hundred ten billion, fifty-one thousand, six hundred five".