787942591645 has 12 divisors (see below), whose sum is σ = 1039302791100. Its totient is φ = 573049157120.

The previous prime is 787942591643. The next prime is 787942591649. The reversal of 787942591645 is 546195249787.

It can be written as a sum of positive squares in 2 ways, for example, as 462756388644 + 325186203001 = 680262^2 + 570251^2 .

It is not a de Polignac number, because 787942591645 - 2¹ = 787942591643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (787942591643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 651191620 + ... + 651192829.

It is an arithmetic number, because the mean of its divisors is an integer number (86608565925).

Almost surely, 2^787942591645 is an apocalyptic number.

It is an amenable number.

787942591645 is a deficient number, since it is larger than the sum of its proper divisors (251360199455).

787942591645 is a wasteful number, since it uses less digits than its factorization.

787942591645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302384476 (or 1302384465 counting only the distinct ones).

The product of its digits is 152409600, while the sum is 67.

It can be divided in two parts, 7879 and 42591645, that added together give a palindrome (42599524).

The spelling of 787942591645 in words is "seven hundred eighty-seven billion, nine hundred forty-two million, five hundred ninety-one thousand, six hundred forty-five".