201645109019 has 16 divisors (see below), whose sum is σ = 211217179392. Its totient is φ = 192141494688.

The previous prime is 201645109013. The next prime is 201645109091. The reversal of 201645109019 is 910901546102.

It is a cyclic number.

It is not a de Polignac number, because 201645109019 - 2²⁴ = 201628331803 is a prime.

It is a super-2 number, since 2×201645109019² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201645109013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6638264 + ... + 6668570.

It is an arithmetic number, because the mean of its divisors is an integer number (13201073712).

Almost surely, 2^201645109019 is an apocalyptic number.

201645109019 is a deficient number, since it is larger than the sum of its proper divisors (9572070373).

201645109019 is a wasteful number, since it uses less digits than its factorization.

201645109019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31426.

The product of its (nonzero) digits is 19440, while the sum is 38.

The spelling of 201645109019 in words is "two hundred one billion, six hundred forty-five million, one hundred nine thousand, nineteen".