155640007 has 2 divisors, whose sum is σ = 155640008. Its totient is φ = 155640006.

The previous prime is 155639993. The next prime is 155640029. The reversal of 155640007 is 700046551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155640007 - 2¹¹ = 155637959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155647007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77820003 + 77820004.

It is an arithmetic number, because the mean of its divisors is an integer number (77820004).

Almost surely, 2^155640007 is an apocalyptic number.

155640007 is a deficient number, since it is larger than the sum of its proper divisors (1).

155640007 is an equidigital number, since it uses as much as digits as its factorization.

155640007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 155640007 is about 12475.5764195487. The cubic root of 155640007 is about 537.9068570528.

Adding to 155640007 its reverse (700046551), we get a palindrome (855686558).

The spelling of 155640007 in words is "one hundred fifty-five million, six hundred forty thousand, seven".