1851766477487 has 2 divisors, whose sum is σ = 1851766477488. Its totient is φ = 1851766477486.

The previous prime is 1851766477409. The next prime is 1851766477513. The reversal of 1851766477487 is 7847746671581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1851766477487 - 2²² = 1851762283183 is a prime.

It is a super-2 number, since 2×1851766477487² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1851766477487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851766477487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 925883238743 + 925883238744.

It is an arithmetic number, because the mean of its divisors is an integer number (925883238744).

Almost surely, 2^{1851766477487} is an apocalyptic number.

1851766477487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1851766477487 is an equidigital number, since it uses as much as digits as its factorization.

1851766477487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 442552320, while the sum is 71.

The spelling of 1851766477487 in words is "one trillion, eight hundred fifty-one billion, seven hundred sixty-six million, four hundred seventy-seven thousand, four hundred eighty-seven".