901778417764493 has 2 divisors, whose sum is σ = 901778417764494. Its totient is φ = 901778417764492.

The previous prime is 901778417764417. The next prime is 901778417764537. The reversal of 901778417764493 is 394467714877109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 738046867012324 + 163731550752169 = 27167018^2 + 12795763^2 .

It is a cyclic number.

It is not a de Polignac number, because 901778417764493 - 2²² = 901778413570189 is a prime.

It is a super-2 number, since 2×901778417764493² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (901778417764193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450889208882246 + 450889208882247.

It is an arithmetic number, because the mean of its divisors is an integer number (450889208882247).

Almost surely, 2^{901778417764493} is an apocalyptic number.

It is an amenable number.

901778417764493 is a deficient number, since it is larger than the sum of its proper divisors (1).

901778417764493 is an equidigital number, since it uses as much as digits as its factorization.

901778417764493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792336896, while the sum is 77.

The spelling of 901778417764493 in words is "nine hundred one trillion, seven hundred seventy-eight billion, four hundred seventeen million, seven hundred sixty-four thousand, four hundred ninety-three".