1861465705381 has 4 divisors (see below), whose sum is σ = 1864532371072. Its totient is φ = 1858399039692.

The previous prime is 1861465705369. The next prime is 1861465705399. The reversal of 1861465705381 is 1835075641681.

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 1861465705381 - 2⁵ = 1861465705349 is a prime.

It is a super-2 number, since 2×1861465705381² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861465705481) 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, 1533331935 + ... + 1533333148.

It is an arithmetic number, because the mean of its divisors is an integer number (466133092768).

Almost surely, 2^{1861465705381} is an apocalyptic number.

It is an amenable number.

1861465705381 is a deficient number, since it is larger than the sum of its proper divisors (3066665691).

1861465705381 is an equidigital number, since it uses as much as digits as its factorization.

1861465705381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066665690.

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 1861465705381 in words is "one trillion, eight hundred sixty-one billion, four hundred sixty-five million, seven hundred five thousand, three hundred eighty-one".