2661666653390 has 32 divisors (see below), whose sum is σ = 5079688187040. Its totient is φ = 1000683224064.

The previous prime is 2661666653389. The next prime is 2661666653411. The reversal of 2661666653390 is 933566661662.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10467647 + ... + 10718906.

It is an arithmetic number, because the mean of its divisors is an integer number (158740255845).

Almost surely, 2^{2661666653390} is an apocalyptic number.

2661666653390 is a deficient number, since it is larger than the sum of its proper divisors (2418021533650).

2661666653390 is a wasteful number, since it uses less digits than its factorization.

2661666653390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21187316.

The product of its (nonzero) digits is 37791360, while the sum is 59.

The spelling of 2661666653390 in words is "two trillion, six hundred sixty-one billion, six hundred sixty-six million, six hundred fifty-three thousand, three hundred ninety".