3661742655672 has 64 divisors (see below), whose sum is σ = 9234220216320. Its totient is φ = 1209948622848.

The previous prime is 3661742655671. The next prime is 3661742655689. The reversal of 3661742655672 is 2765562471663.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661742655671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3111928 + ... + 4124024.

It is an arithmetic number, because the mean of its divisors is an integer number (144284690880).

Almost surely, 2^{3661742655672} is an apocalyptic number.

It is an amenable number.

3661742655672 is an abundant number, since it is smaller than the sum of its proper divisors (5572477560648).

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

3661742655672 is a wasteful number, since it uses less digits than its factorization.

3661742655672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013420 (or 1013416 counting only the distinct ones).

The product of its digits is 76204800, while the sum is 60.

The spelling of 3661742655672 in words is "three trillion, six hundred sixty-one billion, seven hundred forty-two million, six hundred fifty-five thousand, six hundred seventy-two".