1445948917919 has 4 divisors (see below), whose sum is σ = 1577398819560. Its totient is φ = 1314499016280.

The previous prime is 1445948917867. The next prime is 1445948917921. The reversal of 1445948917919 is 9197198495441.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1445948917919 is a prime.

It is a super-2 number, since 2×1445948917919² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445948911919) 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, 65724950804 + ... + 65724950825.

It is an arithmetic number, because the mean of its divisors is an integer number (394349704890).

Almost surely, 2^{1445948917919} is an apocalyptic number.

1445948917919 is a deficient number, since it is larger than the sum of its proper divisors (131449901641).

1445948917919 is a wasteful number, since it uses less digits than its factorization.

1445948917919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131449901640.

The product of its digits is 117573120, while the sum is 71.

The spelling of 1445948917919 in words is "one trillion, four hundred forty-five billion, nine hundred forty-eight million, nine hundred seventeen thousand, nine hundred nineteen".