1864648464681 has 4 divisors (see below), whose sum is σ = 2486197952912. Its totient is φ = 1243098976452.

The previous prime is 1864648464677. The next prime is 1864648464697.

1864648464681 is nontrivially palindromic in base 10.

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 not a de Polignac number, because 1864648464681 - 2² = 1864648464677 is a prime.

It is a super-2 number, since 2×1864648464681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1864648464631) 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, 310774744111 + ... + 310774744116.

It is an arithmetic number, because the mean of its divisors is an integer number (621549488228).

Almost surely, 2^{1864648464681} is an apocalyptic number.

It is an amenable number.

1864648464681 is a deficient number, since it is larger than the sum of its proper divisors (621549488231).

1864648464681 is an equidigital number, since it uses as much as digits as its factorization.

1864648464681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621549488230.

The product of its digits is 169869312, while the sum is 66.

The spelling of 1864648464681 in words is "one trillion, eight hundred sixty-four billion, six hundred forty-eight million, four hundred sixty-four thousand, six hundred eighty-one".