1661422650 has 24 divisors (see below), whose sum is σ = 4120328544. Its totient is φ = 443046000.

The previous prime is 1661422621. The next prime is 1661422661. The reversal of 1661422650 is 562241661.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5537926 + ... + 5538225.

It is an arithmetic number, because the mean of its divisors is an integer number (171680356).

Almost surely, 2^1661422650 is an apocalyptic number.

1661422650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661422650 is an abundant number, since it is smaller than the sum of its proper divisors (2458905894).

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

1661422650 is a wasteful number, since it uses less digits than its factorization.

1661422650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11076166 (or 11076161 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1661422650 is about 40760.5526213765. The cubic root of 1661422650 is about 1184.3863011803.

The spelling of 1661422650 in words is "one billion, six hundred sixty-one million, four hundred twenty-two thousand, six hundred fifty".