1661274530 has 16 divisors (see below), whose sum is σ = 3003471360. Its totient is φ = 661581552.

The previous prime is 1661274509. The next prime is 1661274533. The reversal of 1661274530 is 354721661.

It is not an unprimeable number, because it can be changed into a prime (1661274533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 363650 + ... + 368189.

It is an arithmetic number, because the mean of its divisors is an integer number (187716960).

Almost surely, 2^1661274530 is an apocalyptic number.

1661274530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661274530 is a deficient number, since it is larger than the sum of its proper divisors (1342196830).

1661274530 is a wasteful number, since it uses less digits than its factorization.

1661274530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732073.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 1661274530 is about 40758.7356280835. The cubic root of 1661274530 is about 1184.3511031303.

The spelling of 1661274530 in words is "one billion, six hundred sixty-one million, two hundred seventy-four thousand, five hundred thirty".