1640011657 has 8 divisors (see below), whose sum is σ = 1754629760. Its totient is φ = 1528223760.

The previous prime is 1640011651. The next prime is 1640011697. The reversal of 1640011657 is 7561100461.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640011657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640011651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 706353 + ... + 708670.

It is an arithmetic number, because the mean of its divisors is an integer number (219328720).

Almost surely, 2^1640011657 is an apocalyptic number.

It is an amenable number.

1640011657 is a deficient number, since it is larger than the sum of its proper divisors (114618103).

1640011657 is a wasteful number, since it uses less digits than its factorization.

1640011657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415103.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1640011657 is about 40497.0573869263. The cubic root of 1640011657 is about 1179.2765020512.

The spelling of 1640011657 in words is "one billion, six hundred forty million, eleven thousand, six hundred fifty-seven".