1645371368091 has 48 divisors (see below), whose sum is σ = 2629595135232. Its totient is φ = 983010772800.

The previous prime is 1645371367987. The next prime is 1645371368111. The reversal of 1645371368091 is 1908631735461.

1645371368091 is a `hidden beast` number, since 1 + 6 + 4 + 537 + 13 + 6 + 8 + 0 + 91 = 666.

It is not a de Polignac number, because 1645371368091 - 2⁷ = 1645371367963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645371368491) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 71986621 + ... + 72009473.

It is an arithmetic number, because the mean of its divisors is an integer number (54783231984).

Almost surely, 2^{1645371368091} is an apocalyptic number.

1645371368091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1645371368091 is a deficient number, since it is larger than the sum of its proper divisors (984223767141).

1645371368091 is a wasteful number, since it uses less digits than its factorization.

1645371368091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33184 (or 33181 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 1645371368091 in words is "one trillion, six hundred forty-five billion, three hundred seventy-one million, three hundred sixty-eight thousand, ninety-one".