2455661 has 8 divisors (see below), whose sum is σ = 2670360. Its totient is φ = 2244672.

The previous prime is 2455657. The next prime is 2455679. The reversal of 2455661 is 1665542.

It can be written as a sum of positive squares in 4 ways, for example, as 175561 + 2280100 = 419^2 + 1510^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2455661 - 2² = 2455657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2455681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 551 + ... + 2283.

It is an arithmetic number, because the mean of its divisors is an integer number (333795).

2^2455661 is an apocalyptic number.

It is an amenable number.

2455661 is a deficient number, since it is larger than the sum of its proper divisors (214699).

2455661 is a wasteful number, since it uses less digits than its factorization.

2455661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855.

The product of its digits is 7200, while the sum is 29.

The square root of 2455661 is about 1567.0548809790. The cubic root of 2455661 is about 134.9137263131.

It can be divided in two parts, 245 and 5661, that multiplied together give a triangular number (1386945 = T₁₆₆₅).

The spelling of 2455661 in words is "two million, four hundred fifty-five thousand, six hundred sixty-one".