1661212470 has 16 divisors (see below), whose sum is σ = 3986910000. Its totient is φ = 442989984.

The previous prime is 1661212403. The next prime is 1661212499. The reversal of 1661212470 is 742121661.

1661212470 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 55373749 = 1661212470 / (1 + 6 + 6 + 1 + 2 + 1 + 2 + 4 + 7 + 0).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27686845 + ... + 27686904.

It is an arithmetic number, because the mean of its divisors is an integer number (249181875).

Almost surely, 2^1661212470 is an apocalyptic number.

1661212470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661212470 is an abundant number, since it is smaller than the sum of its proper divisors (2325697530).

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

1661212470 is a wasteful number, since it uses less digits than its factorization.

1661212470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55373759.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 1661212470 is about 40757.9743117835. The cubic root of 1661212470 is about 1184.3363550672.

The spelling of 1661212470 in words is "one billion, six hundred sixty-one million, two hundred twelve thousand, four hundred seventy".