1661254408 has 32 divisors (see below), whose sum is σ = 3400911360. Its totient is φ = 754473280.

The previous prime is 1661254393. The next prime is 1661254409. The reversal of 1661254408 is 8044521661.

It is not an unprimeable number, because it can be changed into a prime (1661254409) 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, 104985 + ... + 119767.

It is an arithmetic number, because the mean of its divisors is an integer number (106278480).

Almost surely, 2^1661254408 is an apocalyptic number.

It is an amenable number.

1661254408 is an abundant number, since it is smaller than the sum of its proper divisors (1739656952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661254408 is a wasteful number, since it uses less digits than its factorization.

1661254408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16077 (or 16073 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 1661254408 is about 40758.4887845465. The cubic root of 1661254408 is about 1184.3463213380.

The spelling of 1661254408 in words is "one billion, six hundred sixty-one million, two hundred fifty-four thousand, four hundred eight".