2661654653556 has 24 divisors (see below), whose sum is σ = 6480550461504. Its totient is φ = 848643512640.

The previous prime is 2661654653543. The next prime is 2661654653561. The reversal of 2661654653556 is 6553564561662.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2661654653556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4821837865 + ... + 4821838416.

It is an arithmetic number, because the mean of its divisors is an integer number (270022935896).

Almost surely, 2^{2661654653556} is an apocalyptic number.

It is an amenable number.

2661654653556 is an abundant number, since it is smaller than the sum of its proper divisors (3818895807948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2661654653556 is a wasteful number, since it uses less digits than its factorization.

2661654653556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9643676311 (or 9643676309 counting only the distinct ones).

The product of its digits is 116640000, while the sum is 60.

The spelling of 2661654653556 in words is "two trillion, six hundred sixty-one billion, six hundred fifty-four million, six hundred fifty-three thousand, five hundred fifty-six".