245542215551 has 4 divisors (see below), whose sum is σ = 245543492712. Its totient is φ = 245540938392.

The previous prime is 245542215547. The next prime is 245542215571. The reversal of 245542215551 is 155512245542.

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

It is a cyclic number.

It is not a de Polignac number, because 245542215551 - 2² = 245542215547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 245542215499 and 245542215508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245542215571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284900 + ... + 756473.

It is an arithmetic number, because the mean of its divisors is an integer number (61385873178).

Almost surely, 2^245542215551 is an apocalyptic number.

245542215551 is a deficient number, since it is larger than the sum of its proper divisors (1277161).

245542215551 is a wasteful number, since it uses less digits than its factorization.

245542215551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277160.

The product of its digits is 400000, while the sum is 41.

The spelling of 245542215551 in words is "two hundred forty-five billion, five hundred forty-two million, two hundred fifteen thousand, five hundred fifty-one".