1954515557143 has 4 divisors (see below), whose sum is σ = 1974665202160. Its totient is φ = 1934365912128.

The previous prime is 1954515557117. The next prime is 1954515557149. The reversal of 1954515557143 is 3417555154591.

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-1954515557143 is a prime.

It is a super-2 number, since 2×1954515557143² (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 (1954515557149) 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, 10074822363 + ... + 10074822556.

It is an arithmetic number, because the mean of its divisors is an integer number (493666300540).

Almost surely, 2^{1954515557143} is an apocalyptic number.

1954515557143 is a deficient number, since it is larger than the sum of its proper divisors (20149645017).

1954515557143 is an equidigital number, since it uses as much as digits as its factorization.

1954515557143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20149645016.

The product of its digits is 9450000, while the sum is 55.

The spelling of 1954515557143 in words is "one trillion, nine hundred fifty-four billion, five hundred fifteen million, five hundred fifty-seven thousand, one hundred forty-three".