5661557500 has 30 divisors (see below), whose sum is σ = 12380699408. Its totient is φ = 2264622000.

The previous prime is 5661557491. The next prime is 5661557507. The reversal of 5661557500 is 57551665.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661557507) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1129812 + ... + 1134811.

Almost surely, 2^5661557500 is an apocalyptic number.

5661557500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

5661557500 is an abundant number, since it is smaller than the sum of its proper divisors (6719141908).

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

5661557500 is a wasteful number, since it uses less digits than its factorization.

5661557500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2264647 (or 2264630 counting only the distinct ones).

The product of its (nonzero) digits is 157500, while the sum is 40.

The square root of 5661557500 is about 75243.3219628161. The cubic root of 5661557500 is about 1782.2911098482.

The spelling of 5661557500 in words is "five billion, six hundred sixty-one million, five hundred fifty-seven thousand, five hundred".