1661563190 has 16 divisors (see below), whose sum is σ = 3418072992. Its totient is φ = 569678784.

The previous prime is 1661563121. The next prime is 1661563213. The reversal of 1661563190 is 913651661.

It is a happy number.

It is a super-2 number, since 2×1661563190² = 5521584468725952200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11868239 + ... + 11868378.

It is an arithmetic number, because the mean of its divisors is an integer number (213629562).

Almost surely, 2^1661563190 is an apocalyptic number.

1661563190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661563190 is an abundant number, since it is smaller than the sum of its proper divisors (1756509802).

1661563190 is a wasteful number, since it uses less digits than its factorization.

1661563190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23736631.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 1661563190 is about 40762.2765556587. The cubic root of 1661563190 is about 1184.4196960458.

The spelling of 1661563190 in words is "one billion, six hundred sixty-one million, five hundred sixty-three thousand, one hundred ninety".