1861507772427 has 32 divisors (see below), whose sum is σ = 2533120128000. Its totient is φ = 1215531487872.

The previous prime is 1861507772413. The next prime is 1861507772429. The reversal of 1861507772427 is 7242777051681.

It is not a de Polignac number, because 1861507772427 - 2¹² = 1861507768331 is a prime.

It is a super-2 number, since 2×1861507772427² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1861507772429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 282086074 + ... + 282092672.

It is an arithmetic number, because the mean of its divisors is an integer number (79160004000).

Almost surely, 2^{1861507772427} is an apocalyptic number.

1861507772427 is a deficient number, since it is larger than the sum of its proper divisors (671612355573).

1861507772427 is a wasteful number, since it uses less digits than its factorization.

1861507772427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9387.

The product of its (nonzero) digits is 9219840, while the sum is 57.

The spelling of 1861507772427 in words is "one trillion, eight hundred sixty-one billion, five hundred seven million, seven hundred seventy-two thousand, four hundred twenty-seven".