901778417766487 has 2 divisors, whose sum is σ = 901778417766488. Its totient is φ = 901778417766486.

The previous prime is 901778417766461. The next prime is 901778417766557. The reversal of 901778417766487 is 784667714877109.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-901778417766487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 901778417766487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (901778417766407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450889208883243 + 450889208883244.

It is an arithmetic number, because the mean of its divisors is an integer number (450889208883244).

Almost surely, 2^{901778417766487} is an apocalyptic number.

901778417766487 is a deficient number, since it is larger than the sum of its proper divisors (1).

901778417766487 is an equidigital number, since it uses as much as digits as its factorization.

901778417766487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5576159232, while the sum is 82.

The spelling of 901778417766487 in words is "nine hundred one trillion, seven hundred seventy-eight billion, four hundred seventeen million, seven hundred sixty-six thousand, four hundred eighty-seven".