1640770601 has 4 divisors (see below), whose sum is σ = 1640870400. Its totient is φ = 1640670804.

The previous prime is 1640770597. The next prime is 1640770609. The reversal of 1640770601 is 1060770461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1640770601 - 2² = 1640770597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640770609) 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 3 ways as a sum of consecutive naturals, for example, 18761 + ... + 60278.

It is an arithmetic number, because the mean of its divisors is an integer number (410217600).

Almost surely, 2^1640770601 is an apocalyptic number.

It is an amenable number.

1640770601 is a deficient number, since it is larger than the sum of its proper divisors (99799).

1640770601 is an equidigital number, since it uses as much as digits as its factorization.

1640770601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99798.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 1640770601 is about 40506.4266629383. The cubic root of 1640770601 is about 1179.4583842546.

The spelling of 1640770601 in words is "one billion, six hundred forty million, seven hundred seventy thousand, six hundred one".