1864461771649 has 4 divisors (see below), whose sum is σ = 1864475903664. Its totient is φ = 1864447639636.

The previous prime is 1864461771631. The next prime is 1864461771661. The reversal of 1864461771649 is 9461771644681.

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.

It is a cyclic number.

It is not a de Polignac number, because 1864461771649 - 2⁵ = 1864461771617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1864461771619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6866227 + ... + 7132600.

It is an arithmetic number, because the mean of its divisors is an integer number (466118975916).

Almost surely, 2^{1864461771649} is an apocalyptic number.

It is an amenable number.

1864461771649 is a deficient number, since it is larger than the sum of its proper divisors (14132015).

1864461771649 is a wasteful number, since it uses less digits than its factorization.

1864461771649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14132014.

The product of its digits is 48771072, while the sum is 64.

The spelling of 1864461771649 in words is "one trillion, eight hundred sixty-four billion, four hundred sixty-one million, seven hundred seventy-one thousand, six hundred forty-nine".