245209254991 has 8 divisors (see below), whose sum is σ = 261930970944. Its totient is φ = 228742832640.

The previous prime is 245209254973. The next prime is 245209255007. The reversal of 245209254991 is 199452902542.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 245209254991 - 2²⁵ = 245175700559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245209254931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63821415 + ... + 63825256.

It is an arithmetic number, because the mean of its divisors is an integer number (32741371368).

Almost surely, 2^245209254991 is an apocalyptic number.

245209254991 is a deficient number, since it is larger than the sum of its proper divisors (16721715953).

245209254991 is a wasteful number, since it uses less digits than its factorization.

245209254991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127646801.

The product of its (nonzero) digits is 2332800, while the sum is 52.

The spelling of 245209254991 in words is "two hundred forty-five billion, two hundred nine million, two hundred fifty-four thousand, nine hundred ninety-one".