7875778497 has 4 divisors (see below), whose sum is σ = 10501038000. Its totient is φ = 5250518996.

The previous prime is 7875778457. The next prime is 7875778567. The reversal of 7875778497 is 7948775787.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7948775787 = 3 ⋅2649591929.

It is a cyclic number.

It is not a de Polignac number, because 7875778497 - 2⁶ = 7875778433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7875778457) 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, 1312629747 + ... + 1312629752.

It is an arithmetic number, because the mean of its divisors is an integer number (2625259500).

Almost surely, 2^7875778497 is an apocalyptic number.

It is an amenable number.

7875778497 is a deficient number, since it is larger than the sum of its proper divisors (2625259503).

7875778497 is a wasteful number, since it uses less digits than its factorization.

7875778497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625259502.

The product of its digits is 193616640, while the sum is 69.

The square root of 7875778497 is about 88745.5829717739. The cubic root of 7875778497 is about 1989.5941612398.

The spelling of 7875778497 in words is "seven billion, eight hundred seventy-five million, seven hundred seventy-eight thousand, four hundred ninety-seven".