1720266706551 has 8 divisors (see below), whose sum is σ = 2294138793600. Its totient is φ = 1146619545272.

The previous prime is 1720266706537. The next prime is 1720266706573. The reversal of 1720266706551 is 1556076620271.

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 1720266706551 - 2¹¹ = 1720266704503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1720266706551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720266706051) 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, 56213595 + ... + 56244188.

It is an arithmetic number, because the mean of its divisors is an integer number (286767349200).

Almost surely, 2^{1720266706551} is an apocalyptic number.

1720266706551 is a deficient number, since it is larger than the sum of its proper divisors (573872087049).

1720266706551 is a wasteful number, since it uses less digits than its factorization.

1720266706551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112462885.

The product of its (nonzero) digits is 1058400, while the sum is 48.

The spelling of 1720266706551 in words is "one trillion, seven hundred twenty billion, two hundred sixty-six million, seven hundred six thousand, five hundred fifty-one".