3621497661 has 16 divisors (see below), whose sum is σ = 5438680320. Its totient is φ = 2381257440.

The previous prime is 3621497599. The next prime is 3621497687. The reversal of 3621497661 is 1667941263.

It is not a de Polignac number, because 3621497661 - 2²³ = 3613109053 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3621497461) 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, 916725 + ... + 920666.

It is an arithmetic number, because the mean of its divisors is an integer number (339917520).

Almost surely, 2^3621497661 is an apocalyptic number.

It is an amenable number.

3621497661 is a deficient number, since it is larger than the sum of its proper divisors (1817182659).

3621497661 is a wasteful number, since it uses less digits than its factorization.

3621497661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837473 (or 1837467 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 3621497661 is about 60178.8805229875. The cubic root of 3621497661 is about 1535.6635272200.

The spelling of 3621497661 in words is "three billion, six hundred twenty-one million, four hundred ninety-seven thousand, six hundred sixty-one".