78221248953 has 4 divisors (see below), whose sum is σ = 104294998608. Its totient is φ = 52147499300.

The previous prime is 78221248951. The next prime is 78221249003. The reversal of 78221248953 is 35984212287.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78221248953 - 2¹ = 78221248951 is a prime.

It is a super-2 number, since 2×78221248953² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78221248896 and 78221248905.

It is not an unprimeable number, because it can be changed into a prime (78221248951) 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, 13036874823 + ... + 13036874828.

It is an arithmetic number, because the mean of its divisors is an integer number (26073749652).

Almost surely, 2^78221248953 is an apocalyptic number.

It is an amenable number.

78221248953 is a deficient number, since it is larger than the sum of its proper divisors (26073749655).

78221248953 is a wasteful number, since it uses less digits than its factorization.

78221248953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26073749654.

The product of its digits is 1935360, while the sum is 51.

The spelling of 78221248953 in words is "seventy-eight billion, two hundred twenty-one million, two hundred forty-eight thousand, nine hundred fifty-three".