661757103 has 36 divisors (see below), whose sum is σ = 1117131600. Its totient is φ = 377330184.

The previous prime is 661757087. The next prime is 661757123. The reversal of 661757103 is 301757166.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 661757103 - 2⁴ = 661757087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661757123) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1429050 + ... + 1429512.

Almost surely, 2^661757103 is an apocalyptic number.

661757103 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

661757103 is a deficient number, since it is larger than the sum of its proper divisors (455374497).

661757103 is an frugal number, since it uses more digits than its factorization.

661757103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953 (or 473 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 661757103 is about 25724.6399974810. The cubic root of 661757103 is about 871.4307294824.

The spelling of 661757103 in words is "six hundred sixty-one million, seven hundred fifty-seven thousand, one hundred three".