1861861887337 has 4 divisors (see below), whose sum is σ = 1905161001040. Its totient is φ = 1818562773636.

The previous prime is 1861861887329. The next prime is 1861861887349. The reversal of 1861861887337 is 7337881681681.

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 1861861887337 - 2³ = 1861861887329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861861887367) 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, 21649556787 + ... + 21649556872.

It is an arithmetic number, because the mean of its divisors is an integer number (476290250260).

Almost surely, 2^{1861861887337} is an apocalyptic number.

It is an amenable number.

1861861887337 is a deficient number, since it is larger than the sum of its proper divisors (43299113703).

1861861887337 is an equidigital number, since it uses as much as digits as its factorization.

1861861887337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43299113702.

The product of its digits is 65028096, while the sum is 67.

The spelling of 1861861887337 in words is "one trillion, eight hundred sixty-one billion, eight hundred sixty-one million, eight hundred eighty-seven thousand, three hundred thirty-seven".