2187566640557 has 32 divisors (see below), whose sum is σ = 2430468218880. Its totient is φ = 1959426201600.

The previous prime is 2187566640521. The next prime is 2187566640583. The reversal of 2187566640557 is 7550466657812.

It is not a de Polignac number, because 2187566640557 - 2³⁶ = 2118847163821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2187566640557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2187566642557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59831432 + ... + 59867982.

It is an arithmetic number, because the mean of its divisors is an integer number (75952131840).

Almost surely, 2^{2187566640557} is an apocalyptic number.

It is an amenable number.

2187566640557 is a deficient number, since it is larger than the sum of its proper divisors (242901578323).

2187566640557 is a wasteful number, since it uses less digits than its factorization.

2187566640557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38333.

The product of its (nonzero) digits is 84672000, while the sum is 62.

The spelling of 2187566640557 in words is "two trillion, one hundred eighty-seven billion, five hundred sixty-six million, six hundred forty thousand, five hundred fifty-seven".