1661214730 has 16 divisors (see below), whose sum is σ = 3417356160. Its totient is φ = 569559312.

The previous prime is 1661214689. The next prime is 1661214733. The reversal of 1661214730 is 374121661.

It is a junction number, because it is equal to n+sod(n) for n = 1661214692 and 1661214701.

It is not an unprimeable number, because it can be changed into a prime (1661214733) 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, 11865750 + ... + 11865889.

It is an arithmetic number, because the mean of its divisors is an integer number (213584760).

Almost surely, 2^1661214730 is an apocalyptic number.

1661214730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661214730 is an abundant number, since it is smaller than the sum of its proper divisors (1756141430).

1661214730 is a wasteful number, since it uses less digits than its factorization.

1661214730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23731653.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 1661214730 is about 40758.0020364100. The cubic root of 1661214730 is about 1184.3368921446.

The spelling of 1661214730 in words is "one billion, six hundred sixty-one million, two hundred fourteen thousand, seven hundred thirty".