19861300645 has 16 divisors (see below), whose sum is σ = 24127044480. Its totient is φ = 15694547904.

The previous prime is 19861300643. The next prime is 19861300661. The reversal of 19861300645 is 54600316891.

It is a cyclic number.

It is not a de Polignac number, because 19861300645 - 2¹ = 19861300643 is a prime.

It is a super-2 number, since 2×19861300645² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19861300643) 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, 64384 + ... + 209446.

It is an arithmetic number, because the mean of its divisors is an integer number (1507940280).

Almost surely, 2^19861300645 is an apocalyptic number.

It is an amenable number.

19861300645 is a deficient number, since it is larger than the sum of its proper divisors (4265743835).

19861300645 is a wasteful number, since it uses less digits than its factorization.

19861300645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145404.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 19861300645 in words is "nineteen billion, eight hundred sixty-one million, three hundred thousand, six hundred forty-five".