1285725815535 has 32 divisors (see below), whose sum is σ = 2474780520960. Its totient is φ = 556825615488.

The previous prime is 1285725815527. The next prime is 1285725815551. The reversal of 1285725815535 is 5355185275821.

It is not a de Polignac number, because 1285725815535 - 2³ = 1285725815527 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 322235052 + ... + 322239041.

It is an arithmetic number, because the mean of its divisors is an integer number (77336891280).

Almost surely, 2^{1285725815535} is an apocalyptic number.

1285725815535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1285725815535 is a deficient number, since it is larger than the sum of its proper divisors (1189054705425).

1285725815535 is a wasteful number, since it uses less digits than its factorization.

1285725815535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644474127.

The product of its digits is 16800000, while the sum is 57.

The spelling of 1285725815535 in words is "one trillion, two hundred eighty-five billion, seven hundred twenty-five million, eight hundred fifteen thousand, five hundred thirty-five".