1651682661 has 8 divisors (see below), whose sum is σ = 2202857184. Its totient is φ = 1100814960.

The previous prime is 1651682621. The next prime is 1651682677. The reversal of 1651682661 is 1662861561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1651682661 - 2¹⁷ = 1651551589 is a prime.

It is a super-2 number, since 2×1651682661² = 5456111225296081842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1651682611) 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, 63835 + ... + 85896.

It is an arithmetic number, because the mean of its divisors is an integer number (275357148).

Almost surely, 2^1651682661 is an apocalyptic number.

It is an amenable number.

1651682661 is a deficient number, since it is larger than the sum of its proper divisors (551174523).

1651682661 is a wasteful number, since it uses less digits than its factorization.

1651682661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153411.

The product of its digits is 103680, while the sum is 42.

The square root of 1651682661 is about 40640.8988704728. The cubic root of 1651682661 is about 1182.0672994282.

The spelling of 1651682661 in words is "one billion, six hundred fifty-one million, six hundred eighty-two thousand, six hundred sixty-one".