1721366745 has 16 divisors (see below), whose sum is σ = 3147642240. Its totient is φ = 786910464.

The previous prime is 1721366719. The next prime is 1721366789. The reversal of 1721366745 is 5476631271.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1721366745 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1721366697 and 1721366706.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8196880 + ... + 8197089.

It is an arithmetic number, because the mean of its divisors is an integer number (196727640).

Almost surely, 2^1721366745 is an apocalyptic number.

1721366745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1721366745 is a deficient number, since it is larger than the sum of its proper divisors (1426275495).

1721366745 is a wasteful number, since it uses less digits than its factorization.

1721366745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16393984.

The product of its digits is 211680, while the sum is 42.

The square root of 1721366745 is about 41489.3570087559. The cubic root of 1721366745 is about 1198.4625553668.

The spelling of 1721366745 in words is "one billion, seven hundred twenty-one million, three hundred sixty-six thousand, seven hundred forty-five".