2766401662640 has 80 divisors (see below), whose sum is σ = 8018972110080. Its totient is φ = 862255061760.

The previous prime is 2766401662601. The next prime is 2766401662643. The reversal of 2766401662640 is 462661046672.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (2766401662643) 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, 224539430 + ... + 224551749.

It is an arithmetic number, because the mean of its divisors is an integer number (100237151376).

Almost surely, 2^{2766401662640} is an apocalyptic number.

2766401662640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2766401662640 is an abundant number, since it is smaller than the sum of its proper divisors (5252570447440).

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

2766401662640 is a wasteful number, since it uses less digits than its factorization.

2766401662640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449091210 (or 449091204 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 50.

The spelling of 2766401662640 in words is "two trillion, seven hundred sixty-six billion, four hundred one million, six hundred sixty-two thousand, six hundred forty".