2553617661 has 8 divisors (see below), whose sum is σ = 3891226944. Its totient is φ = 1459210080.

The previous prime is 2553617657. The next prime is 2553617663. The reversal of 2553617661 is 1667163552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2553617661 - 2² = 2553617657 is a prime.

It is a super-2 number, since 2×2553617661² = 13041926317142221842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2553617663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60800400 + ... + 60800441.

It is an arithmetic number, because the mean of its divisors is an integer number (486403368).

Almost surely, 2^2553617661 is an apocalyptic number.

2553617661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2553617661 is a deficient number, since it is larger than the sum of its proper divisors (1337609283).

2553617661 is a wasteful number, since it uses less digits than its factorization.

2553617661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121600851.

The product of its digits is 226800, while the sum is 42.

The square root of 2553617661 is about 50533.3321778804. The cubic root of 2553617661 is about 1366.8429731367.

The spelling of 2553617661 in words is "two billion, five hundred fifty-three million, six hundred seventeen thousand, six hundred sixty-one".