1002435781557 has 64 divisors (see below), whose sum is σ = 1602999296000. Its totient is φ = 556580808000.

The previous prime is 1002435781541. The next prime is 1002435781573. The reversal of 1002435781557 is 7551875342001.

It is an interprime number because it is at equal distance from previous prime (1002435781541) and next prime (1002435781573).

It is not a de Polignac number, because 1002435781557 - 2⁴ = 1002435781541 is a prime.

It is a super-2 number, since 2×1002435781557² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002435781357) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28575294 + ... + 28610352.

It is an arithmetic number, because the mean of its divisors is an integer number (25046864000).

Almost surely, 2^{1002435781557} is an apocalyptic number.

It is an amenable number.

1002435781557 is a deficient number, since it is larger than the sum of its proper divisors (600563514443).

1002435781557 is an equidigital number, since it uses as much as digits as its factorization.

1002435781557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35871 (or 35857 counting only the distinct ones).

The product of its (nonzero) digits is 1176000, while the sum is 48.

The spelling of 1002435781557 in words is "one trillion, two billion, four hundred thirty-five million, seven hundred eighty-one thousand, five hundred fifty-seven".