7278161542 has 4 divisors (see below), whose sum is σ = 10917242316. Its totient is φ = 3639080770.

The previous prime is 7278161537. The next prime is 7278161543. The reversal of 7278161542 is 2451618727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2451618727 = 43 ⋅57014389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7278161543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1819540384 + ... + 1819540387.

It is an arithmetic number, because the mean of its divisors is an integer number (2729310579).

Almost surely, 2^7278161542 is an apocalyptic number.

7278161542 is a deficient number, since it is larger than the sum of its proper divisors (3639080774).

7278161542 is a wasteful number, since it uses less digits than its factorization.

7278161542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3639080773.

The product of its digits is 188160, while the sum is 43.

The square root of 7278161542 is about 85312.1418204935. The cubic root of 7278161542 is about 1937.9410562846.

The spelling of 7278161542 in words is "seven billion, two hundred seventy-eight million, one hundred sixty-one thousand, five hundred forty-two".