3778745661642 has 32 divisors (see below), whose sum is σ = 8783525030400. Its totient is φ = 1061342606448.

The previous prime is 3778745661641. The next prime is 3778745661659. The reversal of 3778745661642 is 2461665478773.

It is not an unprimeable number, because it can be changed into a prime (3778745661641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 762456292 + ... + 762461247.

It is an arithmetic number, because the mean of its divisors is an integer number (274485157200).

Almost surely, 2^{3778745661642} is an apocalyptic number.

3778745661642 is an abundant number, since it is smaller than the sum of its proper divisors (5004779368758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3778745661642 is a wasteful number, since it uses less digits than its factorization.

3778745661642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1524917610.

The product of its digits is 284497920, while the sum is 66.

The spelling of 3778745661642 in words is "three trillion, seven hundred seventy-eight billion, seven hundred forty-five million, six hundred sixty-one thousand, six hundred forty-two".