1861747572887 has 8 divisors (see below), whose sum is σ = 1971574306416. Its totient is φ = 1751955524992.

The previous prime is 1861747572877. The next prime is 1861747573027. The reversal of 1861747572887 is 7882757471681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1861747572887 - 2¹⁶ = 1861747507351 is a prime.

It is a super-2 number, since 2×1861747572887² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1861747572887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861747572877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8560853 + ... + 8775630.

It is an arithmetic number, because the mean of its divisors is an integer number (246446788302).

Almost surely, 2^{1861747572887} is an apocalyptic number.

1861747572887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1861747572887 is a deficient number, since it is larger than the sum of its proper divisors (109826733529).

1861747572887 is a wasteful number, since it uses less digits than its factorization.

1861747572887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17342817.

The product of its digits is 295034880, while the sum is 71.

The spelling of 1861747572887 in words is "one trillion, eight hundred sixty-one billion, seven hundred forty-seven million, five hundred seventy-two thousand, eight hundred eighty-seven".