1345557778 has 8 divisors (see below), whose sum is σ = 2046764160. Its totient is φ = 663303060.

The previous prime is 1345557757. The next prime is 1345557779. The reversal of 1345557778 is 8777555431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1345557779) 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, 4737738 + ... + 4738021.

It is an arithmetic number, because the mean of its divisors is an integer number (255845520).

Almost surely, 2^1345557778 is an apocalyptic number.

1345557778 is a deficient number, since it is larger than the sum of its proper divisors (701206382).

1345557778 is an equidigital number, since it uses as much as digits as its factorization.

1345557778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9475832.

The product of its digits is 4116000, while the sum is 52.

The square root of 1345557778 is about 36681.8453461655. The cubic root of 1345557778 is about 1103.9958741225.

The spelling of 1345557778 in words is "one billion, three hundred forty-five million, five hundred fifty-seven thousand, seven hundred seventy-eight".