1661035425 has 48 divisors (see below), whose sum is σ = 3176463360. Its totient is φ = 750162240.

The previous prime is 1661035417. The next prime is 1661035451. The reversal of 1661035425 is 5245301661.

It is not a de Polignac number, because 1661035425 - 2³ = 1661035417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24516 + ... + 62634.

It is an arithmetic number, because the mean of its divisors is an integer number (66176320).

Almost surely, 2^1661035425 is an apocalyptic number.

1661035425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1661035425 is a deficient number, since it is larger than the sum of its proper divisors (1515427935).

1661035425 is a wasteful number, since it uses less digits than its factorization.

1661035425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38222 (or 38217 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1661035425 is about 40755.8023476412. The cubic root of 1661035425 is about 1184.2942797190.

The spelling of 1661035425 in words is "one billion, six hundred sixty-one million, thirty-five thousand, four hundred twenty-five".