1661939530 has 16 divisors (see below), whose sum is σ = 2992078440. Its totient is φ = 664645312.

The previous prime is 1661939507. The next prime is 1661939537. The reversal of 1661939530 is 359391661.

It can be written as a sum of positive squares in 4 ways, for example, as 984014161 + 677925369 = 31369^2 + 26037^2 .

It is not an unprimeable number, because it can be changed into a prime (1661939537) 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, 50016 + ... + 76324.

Almost surely, 2^1661939530 is an apocalyptic number.

1661939530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661939530 is a deficient number, since it is larger than the sum of its proper divisors (1330138910).

1661939530 is a wasteful number, since it uses less digits than its factorization.

1661939530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32633.

The product of its (nonzero) digits is 131220, while the sum is 43.

The square root of 1661939530 is about 40766.8925722822. The cubic root of 1661939530 is about 1184.5091120170.

The spelling of 1661939530 in words is "one billion, six hundred sixty-one million, nine hundred thirty-nine thousand, five hundred thirty".