3661557923 has 4 divisors (see below), whose sum is σ = 3663821160. Its totient is φ = 3659294688.

The previous prime is 3661557917. The next prime is 3661557943. The reversal of 3661557923 is 3297551663.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3661557923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3661557943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1129190 + ... + 1132427.

It is an arithmetic number, because the mean of its divisors is an integer number (915955290).

Almost surely, 2^3661557923 is an apocalyptic number.

3661557923 is a deficient number, since it is larger than the sum of its proper divisors (2263237).

3661557923 is a wasteful number, since it uses less digits than its factorization.

3661557923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263236.

The product of its digits is 1020600, while the sum is 47.

The square root of 3661557923 is about 60510.8083155398. The cubic root of 3661557923 is about 1541.3051738215.

The spelling of 3661557923 in words is "three billion, six hundred sixty-one million, five hundred fifty-seven thousand, nine hundred twenty-three".