781158009487 has 4 divisors (see below), whose sum is σ = 788324596840. Its totient is φ = 773991422136.

The previous prime is 781158009469. The next prime is 781158009503. The reversal of 781158009487 is 784900851187.

781158009487 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 784900851187 = 657497 ⋅1193771.

It is a cyclic number.

It is not a de Polignac number, because 781158009487 - 2²⁷ = 781023791759 is a prime.

It is a super-2 number, since 2×781158009487² (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 (781158009287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3583293513 + ... + 3583293730.

It is an arithmetic number, because the mean of its divisors is an integer number (197081149210).

Almost surely, 2^781158009487 is an apocalyptic number.

781158009487 is a deficient number, since it is larger than the sum of its proper divisors (7166587353).

781158009487 is a wasteful number, since it uses less digits than its factorization.

781158009487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7166587352.

The product of its (nonzero) digits is 4515840, while the sum is 58.

The spelling of 781158009487 in words is "seven hundred eighty-one billion, one hundred fifty-eight million, nine thousand, four hundred eighty-seven".