77856775541 has 8 divisors (see below), whose sum is σ = 79688568960. Its totient is φ = 76025944512.

The previous prime is 77856775537. The next prime is 77856775543. The reversal of 77856775541 is 14557765877.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77856775541 - 2² = 77856775537 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77856775543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75581 + ... + 401778.

It is an arithmetic number, because the mean of its divisors is an integer number (9961071120).

Almost surely, 2^77856775541 is an apocalyptic number.

It is an amenable number.

77856775541 is a deficient number, since it is larger than the sum of its proper divisors (1831793419).

77856775541 is a wasteful number, since it uses less digits than its factorization.

77856775541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481195.

The product of its digits is 57624000, while the sum is 62.

The spelling of 77856775541 in words is "seventy-seven billion, eight hundred fifty-six million, seven hundred seventy-five thousand, five hundred forty-one".