916209820551 has 4 divisors (see below), whose sum is σ = 1221613094072. Its totient is φ = 610806547032.

The previous prime is 916209820529. The next prime is 916209820553. The reversal of 916209820551 is 155028902619.

916209820551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155028902619 = 3 ⋅51676300873.

It is not a de Polignac number, because 916209820551 - 2³⁴ = 899029951367 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 916209820551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (916209820553) 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, 152701636756 + ... + 152701636761.

It is an arithmetic number, because the mean of its divisors is an integer number (305403273518).

Almost surely, 2^916209820551 is an apocalyptic number.

916209820551 is a deficient number, since it is larger than the sum of its proper divisors (305403273521).

916209820551 is a wasteful number, since it uses less digits than its factorization.

916209820551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305403273520.

The product of its (nonzero) digits is 388800, while the sum is 48.

The spelling of 916209820551 in words is "nine hundred sixteen billion, two hundred nine million, eight hundred twenty thousand, five hundred fifty-one".