1645629766 has 32 divisors (see below), whose sum is σ = 2808859680. Its totient is φ = 722186080.

The previous prime is 1645629743. The next prime is 1645629781. The reversal of 1645629766 is 6679265461.

It is a happy number.

It is a pancake number, because a pancake can be divided into 1645629766 parts by 57369 straight cuts.

1645629766 is a modest number, since divided by 29766 gives 16456 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66540 + ... + 87856.

It is an arithmetic number, because the mean of its divisors is an integer number (87776865).

Almost surely, 2^1645629766 is an apocalyptic number.

1645629766 is a deficient number, since it is larger than the sum of its proper divisors (1163229914).

1645629766 is a wasteful number, since it uses less digits than its factorization.

1645629766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21381 (or 21359 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 52.

The square root of 1645629766 is about 40566.3624940664. The cubic root of 1645629766 is about 1180.6215642317.

The spelling of 1645629766 in words is "one billion, six hundred forty-five million, six hundred twenty-nine thousand, seven hundred sixty-six".