3561620655 has 16 divisors (see below), whose sum is σ = 5706139104. Its totient is φ = 1897015680.

The previous prime is 3561620653. The next prime is 3561620663. The reversal of 3561620655 is 5560261653.

It is not a de Polignac number, because 3561620655 - 2¹ = 3561620653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3561620653) 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, 145476 + ... + 168185.

It is an arithmetic number, because the mean of its divisors is an integer number (356633694).

Almost surely, 2^3561620655 is an apocalyptic number.

3561620655 is a deficient number, since it is larger than the sum of its proper divisors (2144518449).

3561620655 is a wasteful number, since it uses less digits than its factorization.

3561620655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314426.

The product of its (nonzero) digits is 162000, while the sum is 39.

The square root of 3561620655 is about 59679.3151351454. The cubic root of 3561620655 is about 1527.1530144569.

The spelling of 3561620655 in words is "three billion, five hundred sixty-one million, six hundred twenty thousand, six hundred fifty-five".