1661517662 has 24 divisors (see below), whose sum is σ = 3006126576. Its totient is φ = 674599104.

The previous prime is 1661517623. The next prime is 1661517679. The reversal of 1661517662 is 2667151661.

It is a super-2 number, since 2×1661517662² = 5521281882275892488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159323 + ... + 169430.

It is an arithmetic number, because the mean of its divisors is an integer number (125255274).

Almost surely, 2^1661517662 is an apocalyptic number.

1661517662 is a deficient number, since it is larger than the sum of its proper divisors (1344608914).

1661517662 is a wasteful number, since it uses less digits than its factorization.

1661517662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328800 (or 328781 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The square root of 1661517662 is about 40761.7180943100. The cubic root of 1661517662 is about 1184.4088779694.

The spelling of 1661517662 in words is "one billion, six hundred sixty-one million, five hundred seventeen thousand, six hundred sixty-two".