20615761642255 has 24 divisors (see below), whose sum is σ = 27529046911296. Its totient is φ = 14732851947840.

The previous prime is 20615761642243. The next prime is 20615761642361. The reversal of 20615761642255 is 55224616751602.

It is a happy number.

It is not a de Polignac number, because 20615761642255 - 2²¹ = 20615759545103 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 23 ways as a sum of consecutive naturals, for example, 164956039 + ... + 165080968.

It is an arithmetic number, because the mean of its divisors is an integer number (1147043621304).

Almost surely, 2^{20615761642255} is an apocalyptic number.

20615761642255 is a deficient number, since it is larger than the sum of its proper divisors (6913285269041).

20615761642255 is a wasteful number, since it uses less digits than its factorization.

20615761642255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330037087 (or 330037056 counting only the distinct ones).

The product of its (nonzero) digits is 6048000, while the sum is 52.

The spelling of 20615761642255 in words is "twenty trillion, six hundred fifteen billion, seven hundred sixty-one million, six hundred forty-two thousand, two hundred fifty-five".