2501461661 has 4 divisors (see below), whose sum is σ = 2559635232. Its totient is φ = 2443288092.

The previous prime is 2501461657. The next prime is 2501461681. The reversal of 2501461661 is 1661641052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2501461661 - 2² = 2501461657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2501461681) 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, 29086721 + ... + 29086806.

It is an arithmetic number, because the mean of its divisors is an integer number (639908808).

Almost surely, 2^2501461661 is an apocalyptic number.

It is an amenable number.

2501461661 is a deficient number, since it is larger than the sum of its proper divisors (58173571).

2501461661 is an equidigital number, since it uses as much as digits as its factorization.

2501461661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58173570.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 2501461661 is about 50014.6144741714. The cubic root of 2501461661 is about 1357.4732606567.

The spelling of 2501461661 in words is "two billion, five hundred one million, four hundred sixty-one thousand, six hundred sixty-one".