2661215661527 has 4 divisors (see below), whose sum is σ = 2661335111880. Its totient is φ = 2661096211176.

The previous prime is 2661215661509. The next prime is 2661215661551. The reversal of 2661215661527 is 7251665121662.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2661215661527 - 2³⁸ = 2386337754583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661215961527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59691752 + ... + 59736317.

It is an arithmetic number, because the mean of its divisors is an integer number (665333777970).

Almost surely, 2^{2661215661527} is an apocalyptic number.

2661215661527 is a deficient number, since it is larger than the sum of its proper divisors (119450353).

2661215661527 is a wasteful number, since it uses less digits than its factorization.

2661215661527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119450352.

The product of its digits is 1814400, while the sum is 50.

The spelling of 2661215661527 in words is "two trillion, six hundred sixty-one billion, two hundred fifteen million, six hundred sixty-one thousand, five hundred twenty-seven".