3774215156545 has 4 divisors (see below), whose sum is σ = 4529058187860. Its totient is φ = 3019372125232.

The previous prime is 3774215156447. The next prime is 3774215156557. The reversal of 3774215156545 is 5456515124773.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2752118420401 + 1022096736144 = 1658951^2 + 1010988^2 .

It is a cyclic number.

It is not a de Polignac number, because 3774215156545 - 2³¹ = 3772067672897 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377421515650 + ... + 377421515659.

It is an arithmetic number, because the mean of its divisors is an integer number (1132264546965).

Almost surely, 2^{3774215156545} is an apocalyptic number.

It is an amenable number.

3774215156545 is a deficient number, since it is larger than the sum of its proper divisors (754843031315).

3774215156545 is an equidigital number, since it uses as much as digits as its factorization.

3774215156545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754843031314.

The product of its digits is 17640000, while the sum is 55.

The spelling of 3774215156545 in words is "three trillion, seven hundred seventy-four billion, two hundred fifteen million, one hundred fifty-six thousand, five hundred forty-five".