20015661351015 has 48 divisors (see below), whose sum is σ = 38561905418400. Its totient is φ = 9521458103040.

The previous prime is 20015661350953. The next prime is 20015661351073. The reversal of 20015661351015 is 51015316651002.

20015661351015 is a `hidden beast` number, since 2 + 0 + 0 + 15 + 6 + 613 + 5 + 10 + 15 = 666.

It is not a de Polignac number, because 20015661351015 - 2²⁹ = 20015124480103 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 381442440 + ... + 381494909.

It is an arithmetic number, because the mean of its divisors is an integer number (803373029550).

Almost surely, 2^{20015661351015} is an apocalyptic number.

20015661351015 is a deficient number, since it is larger than the sum of its proper divisors (18546244067385).

20015661351015 is a wasteful number, since it uses less digits than its factorization.

20015661351015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762937424 (or 762937421 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 20015661351015 in words is "twenty trillion, fifteen billion, six hundred sixty-one million, three hundred fifty-one thousand, fifteen".