1661225752635 has 32 divisors (see below), whose sum is σ = 2660685404160. Its totient is φ = 885079433088.

The previous prime is 1661225752577. The next prime is 1661225752649. The reversal of 1661225752635 is 5362575221661.

It is not a de Polignac number, because 1661225752635 - 2²² = 1661221558331 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75283614 + ... + 75305676.

It is an arithmetic number, because the mean of its divisors is an integer number (83146418880).

Almost surely, 2^{1661225752635} is an apocalyptic number.

1661225752635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1661225752635 is a deficient number, since it is larger than the sum of its proper divisors (999459651525).

1661225752635 is a wasteful number, since it uses less digits than its factorization.

1661225752635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26987.

The product of its digits is 4536000, while the sum is 51.

The spelling of 1661225752635 in words is "one trillion, six hundred sixty-one billion, two hundred twenty-five million, seven hundred fifty-two thousand, six hundred thirty-five".