9798626551 has 4 divisors (see below), whose sum is σ = 11198430352. Its totient is φ = 8398822752.

The previous prime is 9798626533. The next prime is 9798626561. The reversal of 9798626551 is 1556268979.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1556268979 = 21839 ⋅71261.

It is a cyclic number.

It is not a de Polignac number, because 9798626551 - 2¹⁹ = 9798102263 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 (9798626501) 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, 699901890 + ... + 699901903.

It is an arithmetic number, because the mean of its divisors is an integer number (2799607588).

Almost surely, 2^9798626551 is an apocalyptic number.

9798626551 is a deficient number, since it is larger than the sum of its proper divisors (1399803801).

9798626551 is a wasteful number, since it uses less digits than its factorization.

9798626551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399803800.

The product of its digits is 8164800, while the sum is 58.

The square root of 9798626551 is about 98988.0121580386. The cubic root of 9798626551 is about 2139.8749854912.

The spelling of 9798626551 in words is "nine billion, seven hundred ninety-eight million, six hundred twenty-six thousand, five hundred fifty-one".