1661356270 has 24 divisors (see below), whose sum is σ = 3478677624. Its totient is φ = 569607696.

The previous prime is 1661356237. The next prime is 1661356271. The reversal of 1661356270 is 726531661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661356271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1694772 + ... + 1695751.

It is an arithmetic number, because the mean of its divisors is an integer number (144944901).

Almost surely, 2^1661356270 is an apocalyptic number.

1661356270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661356270 is an abundant number, since it is smaller than the sum of its proper divisors (1817321354).

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

1661356270 is a wasteful number, since it uses less digits than its factorization.

1661356270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3390544 (or 3390537 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 1661356270 is about 40759.7383455782. The cubic root of 1661356270 is about 1184.3705274277.

The spelling of 1661356270 in words is "one billion, six hundred sixty-one million, three hundred fifty-six thousand, two hundred seventy".