266231054651398 has 4 divisors (see below), whose sum is σ = 399346581977100. Its totient is φ = 133115527325698.

The previous prime is 266231054651381. The next prime is 266231054651417. The reversal of 266231054651398 is 893156450132662.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66557763662848 + ... + 66557763662851.

It is an arithmetic number, because the mean of its divisors is an integer number (99836645494275).

Almost surely, 2^{266231054651398} is an apocalyptic number.

266231054651398 is a deficient number, since it is larger than the sum of its proper divisors (133115527325702).

266231054651398 is a wasteful number, since it uses less digits than its factorization.

266231054651398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133115527325701.

The product of its (nonzero) digits is 55987200, while the sum is 61.

The spelling of 266231054651398 in words is "two hundred sixty-six trillion, two hundred thirty-one billion, fifty-four million, six hundred fifty-one thousand, three hundred ninety-eight".